Celebs Party for Kate Hudson's 30th!

Kate Hudson, who turned the big 3-0 on Sunday, celebrated the milestone with a star-studded bash on Friday night. The party was thrown by Kate's mom, Goldie Hawn, at Goldie and Kurt Russell's home in Pacific Palisades, Ca.

And what a bash it was!

On the guest list -- Demi Moore, Ashton Kutcher, Matthew McConaughey, Tobey Maguire, Jessica Alba, Cash Warren, Gwyneth Paltrow and husband Chris Martin, Gwen Stefani, Eva Mendes, Adam Sandler, Zach Braff and Cher!

Not in attendance, suspiciously, was Kate's on-again boyfriend Owen Wilson.

But which party-goer was wearing the lampshade on their head? Kate's rumored former flame, Justin Timberlake (who came without girlfriend Jessica Biel).

"Justin Timberlake was the life of the party," says a source. "He was dancing, drinking tequila, and he had everyone doing the 'electric slide' on the dance floor."

As for Kate, she seemed to have a blast.

"Kate was elated, dancing all night, having the time of her life - and she looked amazing in a very sexy little dress and [Christian] Louboutin heels," a source told People.com. "She gave a very touching speech and spoke about how important her family is to her."

Sounds so fun! Happy Birthday, Kate!

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