Avril Lavigne accomplished something Friday night she hasn't done in over 3 years ... make that big appearance. Avril was at a Nickelback show at the Greek Auditorium in L.A. when she snatched a mic and performed "Rockstar" with her ex-hubby and Nickelback frontman Chad Kroeger.
You may review, they got hitched in the South of France, a month after they began going in 2013. It turned out poorly. They were single again inside 2 years.
Evidently, no hard emotions.