Justin Bieber celebrates his new single. (Kevin Winter/Getty Images)

You've heard of Justin Bieber's album My World 2.0? Well get ready for the second version of Justin Bieber. This new, more mature Biebs - hello, he turned 18 on March 1! - has a slower musical style, even when he raps, based on the new single "Boyfriend," which was released Monday. While it's been out for less than a day, the song is already the top download at the iTunes store. The track is the first single from Justin's upcoming album, Believe, which is expected in June. As he said on Ryan Seacrest's morning radio show Monday, choosing "Boyfriend" as the lead off song for the project was "a really hard choice." "We had so many songs and so many uptempos that we could've released. I thought we should slow it down a little," he said. "It's just something a little bit more mature, but it's also something that I think I'm ready for." The teen dream explained to Seacrest that the lyrics, which were co-written by Bieber himself, singer Mike Posner ("Cooler Than Me"), Matthew Levy, and Mitchell Musto, describe the kind of significant other he thinks every guy should be - and perhaps the kind of guy he is to 19-year-old lady love Selena Gomez?

While "Boyfriend" definitely has an older vibe than say, "Never Say Never" or "Baby," it's not too grown-up. After all, "Toy Story's" Buzz Lightyear gets a mention!

Michael Buckner/Getty Images for CFN

According to Miley Cyrus, Liam Hemsworth did not in fact put a ring on it. The 19-year-old had been proudly showing off a humongous rock on her left ring finger everywhere from her Twitter page to the red carpet at Muhammad Ali's Celebrity Fight Night over the weekend. After playing coy for days about whether or not she was engaged, Cyrus finally came clean. "I'm not engaged," she tweeted on Monday. "I've worn this same ring on this finger since November! People just wanna find something to [talk] about! It's a topaz people!"

AnnaSophia Robb (The CW)

On "Sex and the City," we watched Sarah Jessica Parker's character Carrie Bradshaw tackle plenty of, um, adult situations. Now, however, it's time to see a more PG version of our favorite Manhattanite. Actress AnnaSophia Robb, the 18-year-old star of family flicks like "Soul Surfer" and "Because of Winn Dixie," will try on Carrie's Manolos for the CW's "The Carrie Diaries," a series about the writer-to-be's life as a high school senior in the '80s premiering this fall.

Fans caught the first glimpse of AnnaSophia dressed as the style icon this week as shooting began. And while her look is a little too much for me, it seems just like the kind of glam, colorful ensemble Samantha, Miranda, and Charlotte's future bestie would string together — especially in the so-called decade of excess! After all, Carrie is the only woman I can think of who can pull off wearing a tutu in the street, a flower pin the size of her head, and a really tall feather in her veil on her original, ill-fated wedding day.

Kevin, Nick, and Joe Jonas hug it out. (Rob Kim/Getty Images)

Let's face it, guys: The Jonas Brothers as a group have been fading into pop culture obscurity for a while now. Their last album, Lines, Vines and Trying Times, was released almost three years ago, and their show, "Jonas L.A.," was cancelled by the Disney Channel in 2010. While the guys have their own projects going on — Nick currently stars in Broadway's "How to Succeed in Business Without Really Trying," Joe released solo album Fastlife in October, and Kevin's enjoying life as a newlywed with wife Danielle Deleasa — their time as a trio seems to have passed, like 98 Degrees, LFO, and many others before them. Fortunately for fans, the New York Post's Page Six reports that the brothers have landed what every celeb needs to return to the spotlight today: a reality show. The JoBros have a development deal with E! and are already filming a "family reality show," according to sources who spoke with the newspaper.

Shailene Woodley (John Shearer/WireImage)

If you aren't a fan of ABC Family's teen mom drama "The Secret Life of the American Teenager," then you probably didn't know who Shailene Woodley was until late last year. But you most likely do now. What changed? The 20-year-old starred opposite George Clooney in one of 2011's most acclaimed films, " The Descendants," and was nominated for a Golden Globe for her role as Clooney's character's rebellious teen daughter Alex. While Woodley lost out to Octavia Spencer in the race for that particular statue, the breakout star has since won a slew of other honors, including an Independent Spirit award, and became a red carpet staple during awards season.

With the Alexander Payne-directed film now out on Blu-ray and DVD, Woodley talked to omg! about, well, a little bit of everything.

Scout Willis performs as half of Gus + Scout. (Thornton/Bosch/INFphoto.com)

You might think that the tabloid frenzy that's surrounded Demi Moore since her high-profile split with Ashton Kutcher last November and the rehab stint that followed would have left her children wanting to stay far away from the life of showbiz. But you'd be wrong. Just last week, her oldest daughter Rumer, 23, with husband Bruce Willis, performed at Hollywood's Sayers Club. And Kutcher even came out to show his support.

This week, it's Demi and Bruce's 20-year-old daughter, Scout, who willingly stepped into the spotlight Thursday as she sang at Rockwood Music Hall in NYC. Scout performed as part of the band Gus + Scout, which also features Gus Wenner, Scout's Brown University classmate, who also has a Hollywood heritage. He's the son of Rolling Stone magazine founder Jann Wenner.

So, is Scout any good? Well, while the duo's far from ready to headline a world tour at this point, video of her crooning the twangy tune "Me and James" at another concert shows that Scout's not just a

When it comes to choosing the most intelligent of the "Jersey Shore" gang - yep, I said intelligent - then my hands down pick is Vinny Guadagnino. He reportedly considered law school before the reality show and has just penned a serious memoir about overcoming his anxiety problems. So, leave it to smart guy Vinny to come up with an answer to a question fans have been asking since Nicole "Snooki" Polizzi announced she was pregnant: Just how will a baby fit in at the shore? Vinny joked to E! that the roommates will simply convert the smush room into a nursery! While Vinny was obviously kidding, I can't help but shudder at the thought of an innocent little one spending one second in the spot where the roomies bring the guys and girls they meet at the club. Ew.

Larry Busacca/Getty Images

What makes One Direction beautiful? Well, to a number of fans, it's not the boy band's recently announced Nickelodeon show.

The U.K. group, which formed on the British "X Factor" two years ago, has exploded in popularity in North America, thanks to an aggressive promotional campaign and a music tour that has girls across the continent screaming their lungs out. (Watch out, Justin Bieber!)

After rumours swirled that the five-member group had been given its own series, Nickelodeon confirmed the news yesterday.

"The rumors are true, our live-action slate does include a development project for @onedirection," the children's network tweeted. "Welcome to the family!"

But many fans of the "What Makes You Beautiful" singers aren't entirely pleased with the collaboration.