Congratulations Deryck Wibley! You win for most utterly passive aggressive ex-husband ever. The Sum 41 singer evidently teamed up with a friend to go as his ex-wife Avril Lavigne and her new fiance, Nickelback singer Chad Kroeger. My guess? I bet Deryck and Avril had an exes with benefits thing going on, and then Chad stepped in and ruined the arrangement. Ah, Canadian drama.