Avril Lavigne and Nickelback frontman Chad Kroeger married at a secret wedding ceremony in July. But for "Let Me Go," the couple's first-ever duet, featured on Lavigne's self-titled album out next month, the Canadian couple sing a different tune—one of angst, heartbreak and romantic failure.

The punk-pop princess sings, "Love that once hung on the wall / Used to mean something, but now it means nothing," as Kroeger counters, "That place is empty, like the hole that was left in me... / Thought we were meant to be." Depressing stuff, right?

Not so fast: In the last minute and a half, the track takes an aural shift with a light, orchestral production backing Lavigne singing a new tune. "Won't let you go / Don't let me go," she repeats in a hushed delivery.

The first two singles off Avril's upcoming fifth album ("Here's to Never Growing Up" and "Rock and Roll") showcased the same, bratty punk-pop princess we all love. But "Let Me Go" may indicate her LP includes more than IDGAF anthems.