03/14/2011 at 01:00 AM EDT
(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
THE SUNSET TOWER HOTEL
The Social Network
's Justin Timberlake
cozied up to girlfriend Jessica Biel
, then mingled with pals Jamie Foxx and Andrew Garfield.
LADY IN RED
"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.
and Selena Gomez
took their romance public at the Vanity Fair
party, holding hands and kissing. "They were so sweet," says a guest.
Gomez and Bieber put on a show inside the party's photo booth.
GIRLS' NIGHT OUT
(in Carolina Herrera) met up with pal Gwyneth Paltrow
(in Michael Kors).
(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
family (from left: Christian Bale
and wife Sibi Blazic; Mark Wahlberg
and wife Rhea Durham; Amy Adams
) toasted their knockout night with Moet & Chandon.
"My favorite part of the night was seeing the Social Network
guys!" said Hailee Steinfeld (getting a squeeze from True Grit
costar Jeff Bridges).
"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
"Everyone was obsessed with him," says a guest of Steven Tyler (with John, whose bash was sponsored by Chopard, Jo & Raffy Manoukian and Godiva).
surrounded himself with former and current reality TV stars, including (from left) his wife, Nicole Richie
, Kim Kardashian
and Kelly Osbourne.
Though he didn't perform, Prince (with guest) held court with John, who duetted on "Tiny Dancer" with Florence + the Machine.
The Kids Are All Right
's Josh Hutcherson hit the floor with Vanessa Hudgens
(left) and Ashley Tisdale
(in a Jenny Packham gown).
Cee-Lo Green (left) got cozy with fellow music stars Seal, Chaka Khan and REM's Michael Stipe (right).