HOLLYWOOD — in the middle of everything is a pool flanked by beach chairs under umbrellas, palm trees, actresses, publicists and hangers-on.

Four good-looking young guys dressed in Hollywood wear — skinny jeans, jackets with collars up — are posing for photographers.

This isn’t a scene out of HBO’s “Entourage.”

This is Nickelodeon, a kids’ channel best known for the cartoon “SpongeBob SquarePants,” introducing the media to the stars of its new comedy “Big Time Rush.”

The show, which premieres Saturday, revolves around a group of Minnesota teenagers, one of whom convinces a talent scout that he and his friends have the makings of a chart-topping boy band.

Right now, the actors are answering questions on set in the fictitious Palmwoods complex of Los Angeles, a reference to the Oakwood apartments where young actors take up residence.

Kendall Schmidt, wearing a beanie, is saying the big difference between “Entourage” and “Big Time Rush,” aside from the latter’s G rating, is that “everyone in the group is talented, not just one guy. everyone becomes famous.”

But “Entourage” — even a G-rated “Entourage” — for 11-year-olds?

“Big Time Rush” is just one example in a growing list of kid shows selling show-biz fantasies to children. Children’s TV has long flirted with the competition for fame (”The Mickey Mouse Club,” anyone?) and the lure of achieving celebrity at a young age has juiced programming across the board in recent years, with “American Idol,” “Gossip Girl,” and reality hits “The Hills” and “Keeping Up With the Kardashians.”

But the genre is stronger than ever now and more fixated on the perks of the glamorous Hollywood lifestyle as Nickelodeon and the Disney Channel compete for the youngest audiences.

Disney airs “Hannah Montana,” “Jonas,” a comedy about rock trio the Jonas Brothers, and “Sonny With a Chance,” starring Demi Lovato as a budding actress and lead of her own TV series.

Now Nickelodeon is putting its spin on celebrity. After “Big Time Rush” debuts this week, the channel early in 2010 will launch “Victorious,” with 16-year-old Victoria Justice as a girl-next-door type whose hidden talents for singing and dancing are discovered, landing her in a performing arts school where the students get parts in films and are courted by music producers.

Before that, Nickelodeon had some success with “The Naked Brothers Band,” a tongue-in-cheek mockumentary about a young rock band.

These shows teach that fame can be a double-edged sword, of course — Hannah and the Jonas Brothers have regular run-ins with overly zealous fans and try their best to lead “normal lives” — but they’re also wish fulfillment at a time when tabloid dreams are ubiquitous. For proof, look no further than “The Hills’ ” reality TV villains Heidi Montag and Spencer Pratt, out now promoting their new advice book, “How to be Famous.”

Nickelodeon’s “iCarly,” 2009’s most-watched TV show among kids 2 to 11, according to the Nielsen Co., is about a girl who has attained a certain level of celebrity by producing and starring in her own Web series. Just a few years ago, by contrast, the channel’s hits involved the more traditional pains of not being popular (”Unfabulous”), adolescent sibling rivalry (”Drake & Josh”) and surviving school (”Ned’s Declassified School Survival Guide”).

Part of the phenomenon stems from the kids’ networks discovering big ancillary bucks to be made in the music business. “Hannah” star Miley Cyrus and the Jonas Brothers are successful pop acts with No. 1 albums and huge touring business (both are signed to Disney’s Hollywood Records), while “Sonny’s” Lovato has released two solo albums. Nickelodeon’s “Big Time Rush” and “Victorious” were developed after the network struck a partnership with Columbia/Epic label Group to produce shows that would revolve around original music.

The strategy is working for Disney Channel, which is winding down its most-watched year ever. in fact, kids’ TV is one thriving area of programming amid declining ratings for the broadcast networks’ prime-time shows.

Also greeting the media alongside the “Big Time Rush” guys, “Victorious’ ” Victoria Justice is chatting up reporters. She says she was bitten by the acting bug after “seeing a Pringles commercial when I was, like, 8 and going, Mommy, I can do that! I wanna be on TV!’ ” Seeing a potential heir to Cyrus’ throne, the new York Post has already run a profile of the starlet, previously a regular on Nickelodeon’s “Zoey 101.”

Whether hawking the lifestyles of the rich, young and famous to kids is fair game for entertainment channels — both Nickelodeon and Disney Channel target kids 2 to 11 and tweens 9 to 14 — depends on how it is presented within the shows, producers say.

“If there is anything I’ve learned about kids today — and I’m not saying this is good or bad — it’s that they all want to be stars,” said Dan Schneider, the creator of “iCarly” and “Victorious” who has spent over a decade producing children’s shows. “Victorious” is his seventh for Nickelodeon.

“I’m not saying it wouldn’t be nice if more of them wanted to be teachers and social workers; it would be. but at least in Victorious,’ you see a world where they’re all working on the talent part.”

“Have you ever seen so many beautiful teenagers in one place?” asked Marjorie Cohn, Nickelodeon executive vice president of original programming and development.

Cohn sees no problem in tapping into a trend that’s “timely and juicy and delicious.”

“Every kid thinks they’re five minutes away and one lucky circumstance from being famous,” she said. “We’ve always responded to what’s out there in the cultural zeitgeist and spin it Nickelodeon style,” adding how “iCarly” in 2007 jumped on the YouTube phenomenon.

But Deborah Linebarger, director of the Children’s Media Lab at the University of Pennsylvania, said the issue is not so much about wanting to be splashed on the cover of us Weekly as it is about “the unrealistic pressure wanting to be famous puts on such a young age group.”

“Of course, there is a sense of escapism in these shows, which can be charming and magical, and that’s fine. but there’s also this sense that such achievements are possible, especially if you’re good-looking, when statistically they really aren’t,” Linebarger said.

While shows like “Gossip Girl” are targeted at young adults, “Nick’s viewers are at a stage when they’re developing their sense of self and are particularly vulnerable to these images,” she said.

Brent Poer, managing director of the West Coast offices of ad-buying company MediaVest, said that because of “YouTube and digital technology and social networks, the idea of fame has changed. It’s a lot easier to become famous.’ “

But he also defends the trend: “It’s very hard to engage a younger audience today without some hooks. Disney’s shows aren’t so much about the industry as they are about dancing and singing and performing,” Poer said. “They still tell stories that have morals; it’s just a lot easier for a kid to swallow the lesson with that backdrop. Otherwise, it’s an after-school special.”

Gary Marsh, president of entertainment for Disney Channels Worldwide, reasoned that “the setting for our storytelling is far less important than the story we tell in that setting.”

That said, the network’s research shows “music and entertainment are a huge part of kids’ lives — and they have tremendous social currency. So it’s not surprising that they also play a part in some of the series and movies that we create.”

Schneider said he’s ambivalent about encouraging the parents of children who ask him how to break into the business. “On the one hand, every parent thinks their kid has it. Most of them don’t.”

He wasn’t discouraged by his parents when at age 18 he told them he was moving west from Memphis, Tenn., to pursue a career in comedy. “The way I see it, you’ve got to encourage everyone so the good ones try.”

Schneider cast Justice in “Zoey 101″ when she was 12 and knew early on that he wanted to develop a show around her.

“Of course, she’s gorgeous and can sing and dance and all that, but she’s also really funny, and my business is comedy. She’s like a young Goldie Hawn,” he said.

“Victorious” inspires kids “to be confident, to be true to themselves. No one’s a celebrity on the show,” Justice said.

During the filming of one scene, Justice’s character, Tori, gets into an argument with a snobby movie star on a film set where Tori is an extra. the exchange ends with Tori being banished from the set. No special treatment here.

Though all the hallmarks of the fabulous life are in place — the stars of “Big Time Rush” and “Victorious” are, in fact, all attractive — the actors work overtime toward their goals.

” big Time Rush’ is much more about what happens the day after you win American Idol,’ ” Nickelodeon’s Cohn said. “The guys’ characters enjoy the perks of Hollywood, but we wrap everything in totally relatable stories.”

One of the first episodes revolves around the group fighting over the same girl; another, about them trying to get out of school work.

Seated inside the boys’ fictitious apartment, “Big Time Rush” executive producer Scott Fellows said his inspiration for the series was more the Monkees than “Entourage.”

His daughter, 11-year-old PJ, wants to be a star too. but he isn’t a fan of the get-famous-quick system that “Idol” has made the norm in the minds of the young.

“I’m not happy about that. I like my stars coming up the old-school way. Kelly Clarkson is pretty solid, but the rest not so much,” he said. “I have to tell PJ, Honey, it’s not easy.’ “

Still, he and Nickelodeon put together “Big Time Rush” (also the name of the band) through a similar nationwide audition. the two-year casting process yielded actors who had been paying their dues.

Schmidt, 19, began acting when he was 6 and played a young Frasier Crane on an episode of “Frasier” and guest-starred in “Gilmore Girls,” “ER” and “CSI: Miami.”

James Maslow, 19, trained with San Diego Opera and appeared on “iCarly.”

Carlos Pena, 20, acted in musical theater productions such as “Titanic,” attended the Boston Conservatory and starred in “Making Menudo,” MTV’s attempt to revive the once-popular Latin boy band via reality TV. It failed.

“Oh, yes, there is irony,” Pena said.

Logan Henderson, 20, the only member of the group without a major credit, said that even with the flashy trappings, the show isn’t about being a star so much as “seeing what it takes to get to that point. the band works hard at being a pop group. … you can apply it to going to college or being an astronaut. It’s about accomplishing something you want to do.”

Also, Schmidt said, “It’s really just a great big comedy. the priority is to make people laugh.”

The same could be said for “Gigantic,” a new scripted drama for Nickelodeon sister network TeenNick about what life would be like if, say, you were the kid of Brad and Angelina. Real-life celebrity offspring Grace Gummer (daughter of Meryl Streep) and Gia Mantegna (daughter of Joe Mantegna) star as friends, one of whom is the daughter of movie star parents while the other is a rising star.

“Gigantic” is geared toward an older audience, but in keeping with the Nickelodeon shows, fame won’t be portrayed as all fun and games.

“I grew up tangential to the industry, and in my mind fame is a drug, and not necessarily a good one,” said executive producer Marti Noxon of “Buffy the Vampire Slayer” fame. “It’s not something that usually makes one happier or smarter or better. Gigantic’ will explore that.”

She added: “And kids really are more skeptical than you think.”

The opening scene of “Ninja Assassin” is a feast of bloodletting so exuberant — and so CGI-induced — that I was reminded of the logo for Fruit Gushers, which shows gooey red glop bursting out of a candy. But in “Ninja Assassin,” the red glop comes from about 30 Japanese gangsters who are hacked apart by shuriken hurled at scramjet velocity.

“It’s a slasher flick,” exclaimed someone at a screening last week.

But who’s throwing the shuriken? if the jokes at the start of “Ninja Assassin” are any indication, ninjas are to law enforcement as sasquatches are to forest rangers. they don’t exist, but they make for great punchlines.

It’s all part of the fun in a film that, at first, tries to float the idea that ninjas are make-believe.

It’s a comedy, a failed love story, a martial arts blowout, and a chance to ask yourself three important questions: Do only “good” ninjas hear heartbeats? Do assassins fight better shirtless? and how does one not constantly trip over a kusarigama during battle? But I’m getting ahead of myself.

“Ninja Assassin” follows Raizo (played by Rain, a Korean singer who appeared as a racer in last year’s “Speed Racer”), an orphan who was kidnapped and trained as an assassin by a clan of ninjas. he is now grown and seeking out his master (and taking out the rest of the clan along the way) to avenge the brutal execution of a girl with whom he was in puppy love. Raizo’s tale is told in flashbacks,

as he trains alongside other kidnapped children. the clans (there are nine of them) seem to subsist off abducted children, and the training seems to consist mainly of child abuse. It’s not pretty, but luckily the film has a tongue-in-cheek feel, whether it’s intentional at all times or not.

For instance, an early scene finds our hero at a laundromat. A battle ensues and when the grisly results are discovered spinning in a washing machine, the film immediately morphs from that image to a close-up of ketchup squirting onto a basket of chopped meat.

Meanwhile, Mika Coretti (played by Naomie Harris, who appeared in the latter two “Pirates of the Caribbean” films), a Europol agent based in Berlin, digs up bank records linking powerful Russians — apparently the KGB does still exist — to a vast underground network of assassins from the Far East that has existed for the past 1,000 years. Eventually, whether because her superior, Ryan Maslow, is incompetent or is working against her, Mika is rescued by Raizo, then rescues Raizo, then falls in love with Raizo, etc., culminating in a finale that will either touch you deeply or make you guffaw.

“Assassin,” directed by James McTeigue (”V for Vendetta”) and produced by Joel Silver and the Wachowski brothers (McTeigue also assisted in the direction of all the “Matrix” movies), is a behemoth of martial arts moves and explicit violence. and Rain cuts a striking resemblance to Bruce Lee, practicing his ninja moves with skin glistening and muscles tightly flexed, and performing rhythmic gymastics-like moves with his kusarigama — a sickle-shaped blade on the end of a long metal chain. But when it comes to the story, “Assassin” is a mish-mash of intrigue that leaves more questions unanswered at every turn.

For instance, are the clans at war with one another or just trying to kill Raizo? who is feeding Raizo his information? How can one ninja dispense with so many others at once when they all have the ability to go into “ghost” mode? why does Raizo sometimes have the healing powers of Wolverine? and finally, do miniature trees know which way to grow?

But grab a big box of popcorn (if you’re sure you’ll be able to keep the kernels down), turn off your mind and prepare to feast on the exploits of, as Maslow puts it, “whack-jobs wearing pajamas.” after all, ninjas don’t really exist, do they?

E-mail Kevin Kelly at kkelly@dailynewsgroup.com.

What: “Ninja Assassin”Upshot: the plot will make your head spin, but the almost non-stop action deliversRunning time: 99 minutesDirected by: James McTeigueStarring: Rain, Naomie Harris and Sho KosugiOPENING: Today