Cheers!

updated 03/14/2011 AT 01:00 AM EDT

originally published 03/14/2011 AT 01:00 AM EDT

REGALLY BLONDE

Reese Witherspoon (flashing plenty of emeralds in her platinum-and-diamond ring and earrings by Neil Lane) gabbed with Elizabeth Banks (in vintage Versace) at the Vanity Fair Oscar Party at the Sunset Tower Hotel. "I feel really lucky to be a part of it!" said Witherspoon of the hoopla.

THE VANITY FAIR OSCAR PARTY

THE SUNSET TOWER HOTEL

GOLDEN COUPLE

The Social Network's Justin Timberlake cozied up to girlfriend Jessica Biel, then mingled with pals Jamie Foxx and Andrew Garfield.

LADY IN RED

Sandra Bullock "was in a great mood," says an onlooker of the actress, who chatted with Mick Jagger.

THE SINGLE GUY

Though he stopped to talk to ex Taylor Swift, Jake Gyllenhaal went stag for the night.

STEPPING OUT

Justin Bieber and Selena Gomez took their romance public at the Vanity Fair party, holding hands and kissing. "They were so sweet," says a guest.

PDA ALERT!

Gomez and Bieber put on a show inside the party's photo booth.

GIRLS' NIGHT OUT

Cameron Diaz (in Carolina Herrera) met up with pal Gwyneth Paltrow (in Michael Kors).

MATERIAL GIRLS

Madonna (in Francesco Scognamiglio) and daughter Lourdes, 14 (in AllSaints), at the Vanity Fair party before heading to Mom's bash at manager Guy Oseary's house in L.A.

THE GOVERNORS BALL

GRAND BALLROOM, HOLLYWOOD & HIGHLAND CENTER

ROUND ONE!

The Fighter family (from left: Christian Bale and wife Sibi Blazic; Mark Wahlberg and wife Rhea Durham; Amy Adams) toasted their knockout night with Moet & Chandon.

TRUE GRIP

"My favorite part of the night was seeing the Social Network guys!" said Hailee Steinfeld (getting a squeeze from True Grit costar Jeff Bridges).

SWAN SONG

"When Natalie won, I breathed a sigh of relief!" said Black Swan director Darren Aronofsky (with Mila Kunis).

THE ELTON JOHN

AIDS FOUNDATION ACADEMY AWARDS VIEWING PARTY, PACIFIC DESIGN CENTER

ROCK ROYALTY

"Everyone was obsessed with him," says a guest of Steven Tyler (with John, whose bash was sponsored by Chopard, Jo & Raffy Manoukian and Godiva).

REALITY RULES

Joel Madden surrounded himself with former and current reality TV stars, including (from left) his wife, Nicole Richie, Kim Kardashian and Kelly Osbourne.

PURPLE REIGN

Though he didn't perform, Prince (with guest) held court with John, who duetted on "Tiny Dancer" with Florence + the Machine.

PARTY ON!

The Kids Are All Right's Josh Hutcherson hit the floor with Vanessa Hudgens (left) and Ashley Tisdale (in a Jenny Packham gown).

SWEET HARMONY

Cee-Lo Green (left) got cozy with fellow music stars Seal, Chaka Khan and REM's Michael Stipe (right).

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