Taylor Swift, Avril Lavigne: Feud Over As Lavigne Appears Onstage At Taylor Swift Concert

It look as if the Taylor Swift-Avril Lavigne feud is officially over. Last night, Lavigne appeared onstage at Taylor's San Diego stop of her 1989 concert tour, and together the pair performed a duet version of Avril's "Complicated."

After the concert, the following photo was shared to Taylor Swift's Instagram account.

Earlier this week, there was some tension between Taylor and Avril after Taylor liked a photo contrasting the way she interacts with fans to the way other celebrities interact with fans. The top of the photo depicts celebrities four celebrities — Avril Lavigne, Katy Perry, Kanye West, and Britney Spears — being a bit standoffish. On the bottom, the photo shows four instances of Taylor excitedly interacting with fans.After Taylor liked the photo on Tumblr, Avril took to Twitter to share her own opinion about the photo.Swift did not respond to Lavigne's tweet.

It seems as if the bad blood has been forgotten, and the Taylor Swift-Avril Lavigne feud is history. After appearing together on stage in San Diego on Saturday, each singer gushed about the other via social media.

And, in true Taylor Swift fashion, the "Wildest Dream" singer welcomed another special guest to the stage Saturday night. Omi performed his current hit song, "Cheerleader."

The performance was one of the first back for Lavigne, who recently returned to the stage after a harrowing battle with Lyme disease. As the Inquisitr reported, Lavigne was bedridden for months as she battled back from the illness.

Find out more about the Taylor Swift-Avril Lavigne feud in the video below.

[Photo by Christopher Polk / Getty Images]