Cheryl Burke, Jack Osbourne, Karina Smirnoff, and other cast members gather at hotspot Hooray Henry's to celebrate the "Dancing With Stars" season premiere; Gwyneth Paltrow, Rebecca Romijn, Tim Robbins, and more hit the Hollywood premiere of Thanks For Sharing; Roma Downey and Matthew Weiner fete Emmy-nominated TV producers; Elton John plays a special show at USC—see who was out and about at Monday's top events in this installment of Last Night's Parties.