Avril Lavigne did something Friday night she hasn't done in more than 3 years ... take the stage.
Avril was at a Nickelback concert at the Greek Theatre in L.A. when she grabbed a mic and performed "Rockstar" with her ex-hubby and Nickelback frontman Chad Kroeger.
You may recall, they got hitched in the South of France, a month after they started dating back in 2013. It did not go well. They were single again within 2 years.
Apparently, no hard feelings.
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