During the 25-year-old singer's concert in San Diego, California on August 29, Avril Lavigne was the latest onstage surprise in Taylor's 1989 world tour.
The two performed Avril's 2002 hit "Complicated." The concert took place almost a week after an alleged social media fued between the fans of the singers. This surprise guest comes after a week of celebrity cameo's in LA.
"We've been texting all week and we finally got to meet today and she's so cool," Swift told the sold-out crowd. "She's so sweet, which I love, when I find out that one of my favorite artists is also super amazing as a person."