It was an all-star jam at Katy Perry's We Can Survive charity show in Los Angeles last night (Oct. 23).
The singer invited her guests -- Tegan + Sara, Ellie Goulding, Sara Bareilles and Kacey Musgraves -- to join her. They all sang along on the the epic, anthemic chorus and did their thing on the verses!
Taylor Swift is memorializing her record-breaking run at the Staples Center in Los Angeles with a behind-the-scenes peek at her onstage duets. The '22' singer brought everyone from Ellie Goulding to Jennifer Lopez out to perform with her in a celebration of girl power, and they all dished on the experience.
Ellie Goulding and Justin Timberlake are both incredible talents in their own rights, and now we can see (or, rather, hear) what they may come up with should they ever join forces. The British chanteuse performed a cover of the Renaissance man's new classic 'Mirrors,' and it was just as beautiful as you'd expect.