Get the Party Started

UPDATED 03/22/2010 at 01:00 AM EDT • Originally published 03/22/2010 at 01:00 AM EDT

VANITY FAIR GALA

SUNSET TOWER HOTEL

DAZZLING DIAZ

Cameron Diaz (who changed into this Victoria Beckham dress) later dug into an In-N-Out Burger at the bash.

MAGGIE'S MOVES

Maggie Gyllenhaal felt like dancing even without a statuette. "I wasn't quite ready to win," she said. "I hope there will be other chances."

RUSSELL GETS ROMANTIC

Russell Brand showed a little love for his fiancee, Katy Perry.

YOUNG GUNS

Vanessa Hudgens and Zac Efron (center) joined Jonas brothers Nick (left), Joe and Kevin, who "have always wanted to go to this party," says a source.

CHILLING OUT

Mad Men's Jon Hamm took a schmooze break with his girlfriend Jennifer Westfeldt.

TAKING THE PLUNGE

Hilary Swank dared to bare in a slinky gown by Armani Prive.

GLAMOUR GIRLS

Jennifer Lopez (in Gucci) and Jessica Simpson (in Carolina Herrera) shared quality time.

"JENNIFER WAS EFFERVESCENT-SHE WAS CHATTING WITH EVERYBODY AND HAVING FUN"

-A GUEST

THE GOVERNORS BALL

THE HOLLYWOOD & HIGHLAND CENTER

A PRECIOUS MOMENT

Their coordinating gowns were just coincidence, but for Gabourey Sidibe, hanging out with Oprah (in Carolina Herrera) "means that I just might be a movie star!"

GIRL POWER

"You took one for the team, baby!" Meryl Streep told Kathryn Bigelow, the first-ever female Best Director.

BOYS' NIGHT OUT

Presenters Ryan Reynolds (left) and Bradley Cooper went solo.

ANNA'S BIG NIGHT

Anna Kendrick (with Sigourney Weaver) called her first Oscar night "unbelievable! Usually I'm on the couch eating the fattiest foods."

MOMENT OF GLORY

Clutching his "heavy and lovely" statue, Best Supporting Actor Christoph Waltz declared, "I'm still in shock."

CAN WE TALK?

Gerard Butler nabbed a spot next to Barbra Streisand. Also at the front-row table? John Travolta, who was inundated with well-wishers.

ELTON JOHN

AIDS FOUNDATION PARTY

THE PACIFIC DESIGN CENTER

"I GOT READY IN AN HOUR AND A HALF-IT'S CRAZY, PEOPLE WHIPPING AROUND YOU DOING THEIR BUSINESS!"

-MAD MEN STAR CHRISTINA HENDRICKS

RAISE THE ROOF

How did Nicole Richie fire up fiance Joel Madden before his gig as Oscar deejay? "She gave me a kiss on the cheek and said, 'Go get 'em,'" said Madden.

WHITE HEAT

"She has been an idol of mine ever since I started watching television," said Elton John of guest of honor Betty White.

SIMON'S SWEETIE

He's still acting coy about being engaged, but Simon Cowell "gazed adoringly" at girlfriend Mezhgan Hussainy, says a fellow partygoer.

"I'M FEELING DISBELIEF. I JUST WANT TO GO HOME AND BE SURROUNDED BY MY FAMILY-THAT WILL MAKE IT ALL THE MORE SPECIAL"

-SANDRA BULLOCK