Avril Lavigne Reunites With Chad Kroeger at Nickelback Concert: Watch

Former couple Avril Lavigne and Chad Kroeger had a reunion over the weekend at—where else?—a Nickelback show. The band usually picks a lucky fan from the audience to perform their 2006 single "Rockstar," and Lavigne just happened to be that person!

The singer hasn't performed on stage in three years, so her appearance at Los Angeles' Greek Theatre on Sept. 8 was even more exciting. "You never know who will join us for 'Rockstar' karaoke. And tonight we got super lucky with these two rockstars. It just might be you next!, Nickelback tweeted. Lavigne also commented, posting a clip from the concert saying "Good to be back on stage! Feeling excited, happy and grateful."