The "Bad Blood" singer wowed her fans by bringing BFF Selena Gomez to the stage to sing her latest single, "Good for You."
That wasn't the only big surprise of the night. Taylor also performed "Mirrors" with Justin Timberlake! Plus, Lisa Kudrow and Taylor entertained all the "Friends" fans with a performance of "Smelly Cat."
[Credit: Christopher Polk/Getty]
Some of the fans in the audience included "Extra's" Mario Lopez and Charissa Thompson, who wrote on Instagram, "Yes those are matching shirts, yes we're 33 years old and a hit at karaoke @ercutler #JustinTimberlakeTaylorSwift."
She has had huge success with the tour, which has grossed $86 million over 20 shows. The number will only grow as she continues in 25 more cities.