Oh, baby! The big-screen adaptation of the popular parenting guide "What to Expect When You're Expecting" is shaping up to be quite the star-studded spectacular.

Jennifer Lopez, Chris Rock and supermodel Brooklyn Decker have all been cast in the film, which stars Cameron Diaz as a fitness instructor.

According to Entertainment Weekly, Lopez will play Holly, a woman who has trouble conceiving and decides to adopt a child from abroad; Decker stars as a NASCAR driver's wife whose worry-free pregnancy with twins inspires envy in  her fellow moms-to-be.

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Looks like Justin Bieber's next album will have all the right stuff—the teen idol's tunes will be inspired by '80s boy bands like New Kids on the Block.

Music producer Jim Jonsin, who is working with the singer on his upcoming album, tells MTV the songs will have an old-school flavor.

"For Bieber, I think I want to reach back to New Edition, those days," he says, adding that he also hopes to emulate another Beantown band. "I want to try to do something like that — 'Please Don't Go Girl,' New Kids on the Block — because the girls would go crazy."

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Celebrities aren't immune to the tough calls of parenthood, and for Jada Pinkett Smith, being a parent has meant giving up her dream of being a rock star.

"I had to make choices," Smith, who is mom to actor Jaden and singer Willow, tells the August issue of Redbook. "Believe me, I would still be on the road with my band, Wicked Wisdom, and making as many movies as I can a year, and doing all sorts of other things if I didn't have the responsibility of a family."

But, she goes on, "I have children with their own talents and dreams, and I know I have to be standing next to them for that journey."

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Playing Frodo in the "Lord of the Rings" movies was a career highlight for Elijah Wood. In fact, the actor says he became a bit depressed when filming on the trilogy ended.

"I was 18 when I traveled to New Zealand, and I was about 20 when I left," he tells New York Magazine's Vulture. "Coming home, I just remember everything feeling kind of foreign. I didn't really know what to do with my time. It was really bizarre. I was more exhausted than I've ever been in my life. I remember feeling like I didn't want to do anything for a while."

Wood adds that he also "just didn't have any perspective on my life anymore, what that was about. It's kind of an unsettled feeling. It's like existing in a place and then being ripped out of it when that place was your home, it was your everything to you for a long time. Sixteen months is a long time."

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She sizzles on the small screen as ravishing redhead Joan Harris, but Christina Hendricks claims her "Mad Men" character was never meant to be sexy.

"When we did the pilot, that was not something that we discussed as a trait for Joan," she tells Parade magazine. "This is something that's developed as a combination of the costuming on the show, the hair and makeup, my portrayal of the role, and Matt's writing. It all kind of came together and that became much more of a focus later. It was just something the audience brought attention to."

Meanwhile, Hendricks may be lending her famous curves to the costume of a very different character: Wonder Woman. According to Vulture, Danish director Nicolas Winding Refn is hoping to helm a big-screen action film about the Amazing Amazon and wants Hendricks to play the heroine. "If I ever get to do it, she's going to be it," he says.

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After weeks of silence, Cheryl Cole is speaking out about being let go from "X Factor" and thanking her fans for standing by her.

"I have had the weirdest past few weeks (nothing unusual there though). I wouldn't even know how to begin to tell you all about it," the former Girls Aloud singer writes on her website. "What I do know for certain is that I have the BEST, most unbelievable people out there, who I feel so lucky to call my support system."

The British beauty, who was reportedly dropped as a judge from the U.S. edition of "X Factor" because her English accent was too thick for American audiences, adds that she is overwhelmed by the outpouring of love.

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Harry Potter fans aren't the only ones wondering what J.K. Rowling has planned for her new Pottermore Web site — even star Daniel Radcliffe has been left in the dark.

“I know nothing about that whatsoever,” Radcliffe tells the L.A. Times of the site, which features two owls, Rowling's signature, and a "Coming Soon" teaser touting the author's June 23 announcement about her new venture. “I’m sure that Jo will be writing a lot more in the coming years. I’m sure she has a lot more in her than we’ve read and a lot more stories to tell. As long as they don’t involve Harry, I’m quite happy to buy them."

Radcliffe, currently starring on Broadway in "How to Succeed in Business Without Really Trying," adds that he has no interest in reprising his role as the world's most famous boy wizard after "Harry Potter and the Deathly Hallows: Part 2" wraps up the film franchise in July.

"I don't know, the idea of going back to something after 10 or 20 years? At that point, I will have worked 20 years to establish a career outside of it," he explains, "and at that point to go back to it would feel a little self-defeating.”

In the upcoming raunchy comedy "Bad Teacher," Cameron Diaz and Justin Timberlake play high-school instructors who explore the subject of the birds and the bees with a fully clothed sex scene. For Diaz, getting intimate with her ex-boyfriend wasn't nearly as awkward as it might have been with another actor in the role.

"That would have been kind of weird to do with someone I didn't know and trust," the actress, who dated Timberlake from 2003 to 2007, tells the L.A. Times. "With somebody else I may not have known where it stood, but we know where it stands."

Diaz added that Timberlake gave his all to their over-the-top encounter.

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As New Kids on the Block and Backstreet Boys enjoy a career comeback with a joint concert tour, *NSYNC star Lance Bass is hoping to have a hit of his own. The singer is producing a new reality show that aims to find the ultimate boy band.

"It's going to be really fun," Bass tells Vulture. "It's a really great music show, starring all your favorite boy bands."

So what's the concept?

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If you're still wondering what Penny's last name is on "The Big Bang Theory," you're not the only one. Even the cast hasn't been clued in about Kaley Cuoco's character, claims star Jim Parsons.

"We really don't know. I've made suggestions. We all have. But nobody will take one," he tells The Wrap. "She really doesn't have one - unless they've been writing one over the summer break. When I left work, Penny had no last name."

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