Taylor Swift's ever-growing squad just got "Complicated."
Tay surprised guests at her San Diego, Calif., 1989 World Tour stop with a cameo by Avril Lavigne.
The pair sang Avril’s 2002 hit together, much to the delight of the Petco Park crowd.
After the concert, Taylor Tweeted photos of herself with the Canadian pop princess.
"So incredible sharing the stage with @AvrilLavigne! 'Complicated' is such a brilliant pop song and I just love her," Taylor captioned the pics.
Avril shared an Instagram photo of herself and Taylor onstage, captioned, Such a Pleasure to perform 'Complicated' tonight with @taylorswift on her #1989 world tour! She ROCKS."
A photo posted by Avril Lavigne (@avrillavigne) on Aug 29, 2015 at 11:17pm PDT
-- Erin O'Sullivan
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