Avril Lavigne's Ex-Husband Dresses Up as Her for Halloween!

Sum 41 singer Deryck Whibley and his girlfriend dressed up as Avril and her fiance, Chad Kroeger. Was it meant as a diss?

They say that imitation is the highest form of flattery -- but should you be flattered if your ex-husband picks you as his Halloween costume?

That's the bizarre situation that singer Avril Lavigne found herself in, after Sum 41 frontman Deryck Whibley (whom she divorced in 2009) made the Halloween rounds dressed in an Avril costume. But it doesn't end there: Deryck was accompanied by girlfriend Ari Cooper, who was also in costume... as Avril's current fiance, Nickelback singer Chad Kroeger!

While LaVigne hasn't commented on her ex-husband's bizarre Halloween tribute, Kroeger had a message for their imitators.

"Hey Deryck loved the costumes! We were going to dress up as you guys this year but all the parties had celebrity themes haha!" the Nickelback frontman tweeted on Sunday. (Burn.)

But Chad, who just played Moscow and St. Petersburg with his band, also had a suggestion for how the couples could settle the score. "You owe us a couples bowling grudge match," he tweeted. "See you when I get back from Russia!"

Lavigne, 28, began dating Whibley when she was just 19; after three years of marriage, they finalized split up in 2009. In interviews, Avril has said that she and Deryck remain on good terms. "I think we're very lucky. We've been friends for a really long time and we always will be family," she said on Ryan Seacrest's radio show in January 2010. "We have a connection. Things are good. I'm really grateful for that."

Following her divorce, the "What the Hell" singer dated Brody Jenner and Wilmer Valderrama, before surprising the world with her whirlwind engagement to Kroeger in August. Wonder if they'll get revenge on Whibley next Halloween? They could go as a Sum 41 CD and a bargain bin... 

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