Parties! The style, stars and scoop from Hollywood's hottest events

Also in Las Vegas, punk rock pair Deryck Whibley and Avril Lavigne shared a table with Emmy-winning Entourage star Jeremy Piven during an evening at Jet nightclub hosted by The Hills villains Heidi Montag and Spencer Pratt. Piven also hit the opening of the Vegas outpost of popular L.A. eatery Koi.