Avril, 30, who returned to the stage for the first time last month since revealing her battle with Lyme disease, took to Instagram after the performance to share her excitement. (Also Read - MTV VMAs: Taylor Swift Dominates With 4 Wins)
She posted on Instagram:
In another post she wrote: "Such a Pleasure to perform Complicated tonight with Taylor Swift on her #1989 world tour! She ROCKS!"
The 25-year-old Bad Blood hitmaker also took to social media to acknowledge Avril's performance.
The concert took place almost a week after Avril's fans were not happy when a post comparing Taylor's interactions with her fans with other stars' meet-and-greets made the rounds on Tumblr.
"We've been texting all week and we finally got to meet today and she's so cool. She's so sweet, which I love, when I find out that one of my favourite artists is also super amazing as a person," Taylor told the crowd.