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Justin Bieber knows how to get the crowd going wild!

The "Baby" singer hit the stage at KIIS-FM's Jingle Ball show at the Nokia Theatre in L.A. wearing a sexy black shirt. We couldn't help but notice those bulging muscles. Pump it up, Biebs.

As for Ke$ha, the 25-year-old "Die Young" singer strutted her stuff in a gold leotard and even did a cartwheel. Whoa ... that's a whole lot to look at!

See more pics from the show in our gallery below.

Last night Quentin Tarantino was honored at the Museum of Modern Art, and everyone from Diane Kruger (who starred in his film, Inglourious Basterds) to Chelsea Clinton were in attendance.

Kruger and Peter Bogdanovich gave speeches praising the writer/director/actor for his vision, and Bogdanovich told the crowd, "A Quentin Tarantino picture is exactly that: It's all him. It's all his. Dynamically, viscerally, excitingly his. An unmistakable signature. And he has had a remarkable influence over American and foreign movies since Pulp Fiction burst on the screen in the mid-'90s. Indeed, I would say he is the single most influential director of his generation."

Bogdanovich added that he had just seen Django Unchained the previous night, and he considered it Tarantino's best work yet. "I'm still shaking," he remarked.

Anne Hathaway has never looked sexier!

The 30-year-old Les Miserables actress is flashing a big smile and short shorts in Glamour's January issue.

When asked about her short 'do, Hathaway tells the mag:

“People are warmer to me. Also, I’m a fairly shy person,and [in the past] on days when I didn’t want to deal with the world, I’d wear a hat and pull my hair around me and hide. I can’t do that now. I have to be me all the time. And it’s changed my habits, because if I was having a bad skin day, I could have a good hair day. Now I have no hair, so I have to take better care of myself because I’m all face!”

Anne looks stunning in bright yellow while rockin' those headphones. You go, girl!

Kate Bosworth is adding a whole lotta sex appeal to the holidays in a stunning Christmas campaign for Topshop.

The blonde beauty performs a sultry version of the classic song "Winter Wonderland" in a mini-movie released by the clothing company.

Michael Polish, Kate's fiance, directed his bride-to-be in this beautifully-shot performance. Kate's custom-made Topshop evening dress is to die for.

Topshop is also hoping that her version of "Winter Wonderland" will make it to the Number 1 spot on iTunes during this holiday season. Time will tell!

Making their first public appearance as a couple since his wife Mary's suicide in May, Robert F. Kennedy Jr. and girlfriend Cheryl Hines attended the 2012 Ripple of Hope gala in New York City last night.

Kennedy's deceased former spouse was apparently driven to take her own life earlier this year amidst increasing financial woes, a bitter divorce battle and upset over his budding relationship with the Curb Your Enthusiasm star.

The gala is held by the Robert F. Kennedy Center for Justice and Human Rights and supports members of the international business, entertainment and activist communities who are committed to social change.

Taylor Swift not only performed at the bash, but was also presented the Ripple of Hope Award as members of ex-boyfriend Conor Kennedy's family looked on with pride.

Later in the evening, T-Swizzle was spotted strolling the streets and holding hands with One Direction beau Harry Styles, who performed Madison Square Garden earlier that night.

Check out the other celebs in attendance in the gallery!

Heidi Klum is definitely a breath of fresh air!

The gorgeous supermodel arrived at Good Morning America rocking black leather pants, a red-embroidered shirt and Christian Louboutin heels. So sexy!

Klum has partnered with American Red Cross to bring toys for the victim's of Hurricane Sandy.

Such a beauty ... inside and out!

When in Amsterdam, Chris Brown apparently likes to get his puff on!

The singer snapped several photos of himself inside a "coffee shop" smoking on what appears to be weed. In fact, in one photo, he has three joints in his mouth.

Brown Tweeted, "dont worry, its medicinal." Gotta love natural medicine.

Rihanna's beau performs at Amsterdam's Ziggo Dome on December 6.

Glen Wilson

Ashton Kutcher does his best Steve Jobs impersonation as he sports a goatee, button-down shirt and jeans in the first official photo for his upcoming film, jOBS.

The 34-year-old actor showed off his stunning transformation into the late Apple founder in this picture released by the Sundance Film Festival. The biopic will be the closing-night film at the festival, which runs from January 17-27 in Park City, Utah.

With his uncanny resemblance and much talked about performance in the role, something tells us he's going to blow audiences away!