Deryck Whibley and Ari Cooper

Deryck Whibley and his girlfriend Ari Cooper went as Whibley's ex-wife Avril Lavigne and her fiance at the time, Nickleback Singer Chad Kroeger. Kroeger hit back at Whibley on Twitter, writing Hey Deryck loved the costumes! We were going to dress up as you guys this year but all the parties had celebrity themes haha! – CK

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