Taylor Swift Brings Avril Lavigne Out for 'Complicated' Duet After Reported Tumblr Feud! (Video)

Taylor Swift rocks out on stage with special guest Avril Lavigne during her 1989 Tour stop at PETCO Park on Saturday night (August 29) in San Diego, Calif. The duo sang Avril‘s 2002 hit “Complicated,” which you can watch below! The performance certainly cleared up any rumors that Avril threw shade at Taylor on Tumblr