Clay on ET on MTV and VH1

Also on "ET on MTV & VH1" this weekend: You've probably heard about TARA REID's wardrobe malfunction at P.Diddy's party, but we've got the other celeb sightings from the birthday bash, including PARIS HILTON, MARIAH CAREY and CARSON DALY; speaking of birthdays, we're celebrating the big 3-1 with cutie NICK LACHEY & JESSICA SIMPSON in Las Vegas; now you can have CLAY AIKEN 12 months a year with his brand-new calendar; BRAD PITT, MATT DAMON and the rest of the 'Ocean's Twelve' cast are spilling secrets; and we tell you how to dress like MISCHA BARTON, RACHEL BILSON and your fave stars from "The O.C."!