Marc Malkin

UPDATE: I’ve got more details for you from George Clooney’s birthday bash.

There were actually two birthday cakes made by cake and pastry company How Sweet It Is! One was for Clooney in the shape of Italy, where he owns a villa.

The other was for David Beckham, who turned 33 on Friday. The soccer star’s cake was in the shape of the United States.

I’m told John Mayer performed and Sarah Silverman even shocked some party guests when she spent some time working as Bungalow 8’s doorperson.

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George Clooney turns 47 today, but the world’s most famous hunk started celebrating last night.

Giorgio Armani hosted a birthday bash for the Oscar winner after the Costume Institute Gala. It was invite-only, a source reports, for about 100 people at Amy Sacco’s legendary hot spot Bungalow 8. Clooney picked the venue, I'm told.

So just who made the VIP guest list?

Powerhouse RSVPs included Tom Cruise, Katie Holmes, David and Victoria Beckham, Naomi Watts, Hilary Duff, Donatella Versace, the Olsen twins, Clive Owen, TV Superman Tom Welling, Vogue editor-in-chief Anna Wintour and her entertainment editor, Jill Demling, CAA superagents Bryan Lourd and Kevin Huvane, Chace Crawford, Emmy Rossum, Zac Posen, Kate Mara, professional golfer Adam Scott and, of course, Clooney’s girlfriend, Sarah Larson.

There was even a birthday cake. And yes, most everyone joined in to sing “Happy Birthday.”

No word if Clooney actually had some of the high-calorie dessert because, I’m told, he and Cruise were overheard at the Met talking about healthy eating habits and their trainers.

It’s still unclear if good friend Julia Roberts made it to Bungalow. “I didn’t see her,” one partygoer said. “But it was so crowded, she could have been and I just didn’t see her.”

Socialista was another after-party hot spot. Many A-listers stopped in there before heading to Clooney’s soirée, including Welling, Posen and Mary-Kate Olsen. Among the other boldfaced names crowding Socialista were Michelle Trachtenberg, Ellen Barkin, Dita Von Teese, Domenico Dolce and Stefano Gabbana, and Proenza Schouler design duo Jack McCollough and Lazaro Hernandez.