Forget a scary monster or evil witch, this Halloween Dereck Whibley found inspiration from an unusual source - his ex-wife Avril Lavigne.

And his girlfriend Ari Cooper joined in the fun by taking the role of Avril's fiancé, Chad Kroeger. With Deryck's khohl-ringed eyes, blonde multi-hued hair and pout, and Ari's fake facial hair, the pair looked uncannily like the couple.

But one person not amused was Nickelback frontman Chad, who tweeted: 'Hey Deryck loved the costumes! We were going to dress up as you guys this year but all the parties had celebrity themes haha!'

Deryck, 32, was married to Avril between 2006 and 2009. He is the singer in rock band Sum 41, who were huge in 2002, but have had mixed fortunes of late.

Chad, 37, later sent another message to Deryck, confirming he was only joking, writing: 'You owe us a couples bowling grudge match see you when I get back from Russia!'

Although Deryck and Avril, 28, are divorced, they are still friends, and he worked on her 2011 album Goodbye Lullaby as co-producer and guitarist.

Avril is likely to have found Chad's response amusing as she recently admitted she fell for the rocker because of his sense of humour.

沪江娱乐快讯：

人气摇滚小魔女艾薇儿的前夫德瑞克·韦伯利在上周末的万圣节Party上恶搞，与其现任女友阿丽·库珀一起装扮成艾薇儿和她的现任男友查德·克罗格。据此，看过照片后的查德·克罗格在Twitter上大方表示，他喜欢他们的装扮。还说，“我们也考虑要打扮成你们乐队的模样，但是很可惜今年我参加的每一个派对都有自己的主题。”对此，艾薇儿回应道，她很喜欢查德的回答。

艾薇儿与前任男友，流行朋克乐队SUM 41的成员德瑞克·韦伯利，于2006年在加州结婚，并在2009年正式分居。虽然离婚了，但两人仍是朋友。艾薇儿的现任男友查得·克罗格是加拿大五分钱乐队的主场，也是艾薇儿新专辑的制作人，两人是在创作新专辑的过程中檫出了爱情的火花，在相处半年后修成正果，并在今年八月份订婚。