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Avril Lavigne, Deryck Whibley

Denise Truscello/Getty Images

It turns out that Deryck Whibley has been holding onto a piece of Avril Lavigne all this time.

Lavigne filed for divorce in 2009 and remarried this summer, but only today did Whibley file a petition to legally drop his ex-wife's last name, which he had adopted as one of his middle names after they tied the knot in 2006.

Per court documents obtained by E! News, the Sum 41 singer would like to be Deryck Jason Whibley again, as opposed to Deryck Jason Lavigne Whibley.

How very John-and-Yoko of them.

Lavigne swapped vows with Nickelback frontman Chad Kroeger in July, the bride wearing a black Monique Lhuillier gown for the occasion.

It's hard to tell whether it was a dark day as well for Whibley, who dressed as his ex-wife for Halloween last year while his girlfriend Ari Cooper went as Kroeger.

"Hey Deryck loved the costumes!" Kroeger tweeted from Nickelback's account. "We were going to dress up as you guys this year but all the parties had celebrity themes haha!"

Well, at least now there's one less thing tying Whibley to his past. In fact, maybe this is a sign that he's thinking of evening the score and retying the knot himself.

Speaking out from under the shadow of a pileup of pregnancy rumors, Lavigne told E! News Tuesday night at the release party for her self-titled new album that she isn't ready for motherhood just yet.

"I want one or two [kids], but not right now," the 29-year-old said. "Like, in the future."