Another star-studded Monday night in Hollywood brought the Gastineau Girls (Brittny and Lisa), The Actors' Studio's James Lipton, Mike Tyson and Barry Manilow to Mr. Chow's. Avril Levine was spotted hiding out at Koi. 90210's Ian Zearing partied casually @ Hyde Lounge. David Weintraub accompanied by a Pussycat Doll, Wilmer Valderama, and Calum Best party at Joseph's.