In other birthday news, Ellen Degeneres and Portia de Rossi doubled their b-day fun by throwing a joint house party to celebrate Ellen's 51st and Portia's 36th. Talk about a star-studded affair -- the celebs' guests were Jennifer Aniston, Courteney Cox Arquette, Drew Barrymore, Ben Stiller, and Sacha Baron Cohen, just to name a few. Spinning the tunes was Samantha Ronson, who brought along Lindsay Lohan to spin her own mix for the b-day girls. We can bet there was a lot of dancing!