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I guess when one of the funniest men on the planet invites you to a party at his pad, you come!

In addition to Ellen and Portia, Jennifer Aniston (taking a break from her Mayer-athon) and Courteney Cox showed up with Coco in costume, Tobey Maguire and Jennifer Meyer brought cowgirl Ruby, and even Superbad Jonah Hill, Laura Dern with Ben Harper and Rosanna Arquette put in an appearance to the cowboy themed birthday party!

Yeehaw!

Check out our monster gallery below!