Oscars After-Parties

It wouldn't be Hollywood's biggest night without Hollywood's biggest parties! This year, power couples new and old were out in full force. Case in point, Tom Cruise and Katie Holmes (in Elie Saab) posed with pals Victoria Beckham (in her own design) and David Beckham (in Christian Dior) at the famed Vanity Fair fete. Meanwhile, Kim Kardashian and Heidi Klum were enjoying a ladies night out at Sir Elton John's annual bash. Click out for more of the night's hottest pairings!

It was a "fun sister night" for Kim and Kourtney Kardashian who were spotted having girl talk with the statuesque Heidi Klum (in Atelier Versace) at Sir Elton John's 20th annual party. The expectant Kourtney went for a "comfortable, but stylish" vibe in a flowing Raoul gown, while Kim accented her Azzedine Alaia design with Lorraine Schwartz jewelry.

Gwen Stefani

(in Zuhair Murad) cuddled up with the men of the evening, David Furnish and Sir Elton John at their 20th annual post-Oscars bash. Although the couple weighed in on each other's outfits, they went their own way fashion-wise. "He went and got his own Tom Ford," said Sir Elton of his husband's look. "This is by Alex Couture of Beverly Hills. And it's got my name on the back. I want to be a little glitzy because we've got Adam Lambert coming. We've got Katy Perry. So I wanted to try and wear something a little sparkly."

Red has never looked so good! Gal pals Cameron Diaz (in a Victoria Beckham gown and David Webb jewelry) and Kate Hudson (in vintage Versace and Tiffany & Co. gems) posed seductively in the hot hue at the Vanity Fair Oscar party.

Fellow Best Actress nominees Michelle Williams (in Louis Vuitton) and Glenn Close (in Zac Posen) cut a fine figure at the Vanity Fair event.

A pair of Hollywood legends (and Oscar winners) at the Vanity Fair soiree! Gwyneth Paltrow (in Tom Ford) celebrated with Jane Fonda (in a Dilek Hanif gown and Chopard diamonds).

Kate Hudson

(in vintage Versace) enjoyed a date night out with fiance (and Muse frontman) Matthew Bellamy at the Vanity Fair party.

Nominee Jessica Chastain (in Alexander McQueen) smiled alongside Gerard Butler (in Gucci) at the Vanity Fair party.

At the 20th Annual Elton John AIDS Foundation Academy Awards viewing party, Katy Perry partied with fellow funnylady Cloris Leachman. The blue-haired Perry chose a matching gown from the appropriately-named Blumarine label, telling us "I feel like a mermaid!"

Chris Evans

palled around with presenter Sandra Bullock (in Marchesa) at the Vanity Fair do.

Best Actress winner Meryl Streep caught up with host Billy Crystal at the Governors Ball.

Sports Illustrated

swimsuit issue cover model Kate Upton (in a Valentino dress and David Webb gems) and Denver Broncos quarterback Tim Tebow were easily the most buzz-worthy pair at the Vanity Fair party!

Miley Cyrus

and boyfriend Liam Hemsworth painted the town in retro chic. "I just always love pinup girls," Cyrus said of the inspiration behind her Roberto Cavalli gown. "I think it's the most fabulous time."

Jennifer Lopez

got cozy with her backup dancer beau Casper Smart at the Vanity Fair party. The presenter swapped out her awards show Zuhair Murad gown for a deep burgundy couture look from the designer, accented with H. Stern earrings and a Swarovski clutch.

New couple Olivia Wilde (in Gucci) and Jason Sudeikis posed for snaps at the Vanity Fair Oscars party.

Actress/director Jennifer Westfeldt (in Johanna Johnson) toasted the Vanity Fair event with a Vivienne Westwood-clad Amy Adams.

Glee

girl Dianna Agron (in a mushroom-print Carolina Herrera dress) and Malin Akerman (in a Sportmax dress and Neil Lane gems) made a fashionable duo at the Elton John bash. Of her dress, Akerman said: "I think it's just kind of a mix between edgy and feminine-I like sort of the constructive pieces of it."

Vampire Diaries

stars Nina Dobrev and Ian Somerhalder made a night of it at the Elton John affair. "This is J. Mendel," Dobrev said of her dress. "My inspiration was Rooney Mara meets Audrey Hepburn. With a little flair."

It was ladies night at the Vanity Fair party for Adepero Oduye, Elizabeth Olsen and Lily Collins (in Monique Lhuillier).

It was a The Descendents reunion for Shailene Woodley (who changed into Proenza Schouler) and Judy Greer at the Vanity Fair Oscars party.