They say imitation is the sincerest form of flattery. Sum 41′s Deryck Whibley and his model girlfriend Ari Cooper celebrated Halloween by dressing up as Whibley’s ex-wife, Avril Lavigne, and her fiancee, Nickleback lead singer Chad Kroeger. And in an added twist, the couple put on their best drag get-ups, with Whibley dressing as Lavigne...Read more»