After seeing the picture on Twitter, Chad Kroeger just had to get back at Deryck.
"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"
That was a good one!
Besides, Deryck seems a little bit obsessed with Avril... what girlfriend thinks it's cool for their boyfriend to dress up as the ex-wife?
SOURCE: TMZ Photo Credit: Deryck Whibley Twitter