Macy Gray, Ross Matthews, Rex Lee and Gloria Allred celebrate The Advocate's 45 years of publication; Adrian Grenier, Sacha Baron Cohen and Heather Graham hobnob at the opening of MySpace CTO Aber Whitcomb's new LA tech "incubator"; the Real Housewives headline a Night Of A Billion Reality Stars; Seth Rogen plays The Dude in Jason Reitman's LACMA live read of The Big Lebowski: Thursday was kind of a big deal here in LA, and we've got all the details in this edition of Last Night's Parties.