Inside Madonna & Demi Moore's Oscar Party

After Sunday's Academy Awards, everyone flocked to Madonna's manager Guy Oseary's L.A. home for a bash hosted by the pop dvia and Demi Moore. There was dancing, a late-night Indian food and tons of A-Listers. Here's what happened inside the party:

• "Madonna danced non-stop for four hours,” says a source. "She and Gabourey [Sidibe] were dancing together at one point. They had a great time." Other stars on the dance floor: Moore, hubby Ashton Kutcher and Diddy, who commandeered the mic throughout the night. At one point, the music mogul stopped the music and said that unless Anderson Cooper started dancing, he wouldn't play any more music. Luckily, the CNN anchor quickly hit the dance floor!

• Renée Zellweger and Bradley Cooper were "adorable and super close all night," a source tells us, adding that the actress and her beau stayed at the bash past 4 a.m. The Hangover star, meanwhile, also hung out in the library, where Jack Nicholson was holding court with fellow revelers like Woody Harrelson and Kate Walsh.

• Penélope Cruz had quite a look at the party: The actress sported a faux-moustache, while Javier Bardem was wearing a feathered boa at the beginning of the party.

• There were 300 guests at the party, including Taylor Lautner, Lady Gaga, Jeremy Renner, Leonardo DiCaprio, Gerard Butler and more. Around 3 a.m., the source says, they served Indian food, which everyone was "inhaling." There was also a special drink, created for the party by Moore: the Vita Coco Caipirinha. (Moore and Madonna are investors in the company.) "Everyone was drinking it and they gave out versions of it to people on the way out," says the source. "This was the Oscar party to be at this year," says the source. "This turned out to be the party that everyone wanted to be at."

Demi Moore is Officially Changing Her Name

After four years of marriage Demi Moore is celebrating her anniversary with husband Ashton Kutcher by taking his last name.

Demi was born Demi Gene Guynes and is on her third marriage. From 1979-1985 she was married to Freddie Moore, 1987-2000 Bruce Willis, with whom she has three beautiful daughters, and then married Kutcher in 2005.

Demi got her stage name from her first husband and felt hesitant to switch it but a source close to Moore said that she finally feels like the time is right to become Demi Kutcher.

Star Sighting: No Punking Zone!

Not with all that Secret Service around, though Ashton Kutcher, getting formal with Demi Moore at the White House Correspondents' Dinner on Saturday night in Washington, mused on his Twitter page: "I'm trying to figure out why anyone would let me sit this close to the president".

Demi & Ashton Spend Holidays With Bruce

So you think your Christmas is going to be dysfunctional? According to Page Six, Ashton Kutcher and Demi Moore plan to celebrate Christmas with Bruce Willis and his girlfriend, Emma Heming. Can we say awkward? The couples just returned from "an unconventional Thanksgiving" together in Europe, Moore said, but it looks like they're getting ready for round two.

Even though the families just spent Thanksgiving together in France to celebrate daughter Scout Willis' debut at Europe's most prestigious debutante ball, the Crillon Ball, they plan to reunite.

"We had an unconventional Thanksgiving, and we will all be together for Christmas as well with our three daughters. I think the key with any past is that you recognize and hold on to what you loved and what you gained and you don't attach yourself to what you've lost," Moore said.