Jeremy Piven was in fine form the other night at the Light Group’s party at Teddy’s in Los Angeles. “He was flirting with two brunettes all night,” says a spy. “Eventually, one of them ended up giving him a lap dance to the Kings of Leon song ‘Sex on Fire.’ ” That fish-free diet must be doing wonders for Piven’s libido. Also at the party was Eva Longoria Parker, who spent much of the time dancing and taking pictures of friends.