Avril Lavigne Performs Fist Time in Years with Nickelback, Ex-Husband Chad Kroeger

TMZ Staff

socastcmsRssStartTMZ StaffsocastcmsRssEndAvril 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…