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Jennifer Lopez Joins Taylor Swift Onstage for ‘Jenny From the Block’ – Her ‘Hairbrush Song’

The duo team for surprise duet at Staples Center Saturday night

Taylor Swift has been bringing in guest stars since she started her Red concert tour, but she one-upped herself Saturday night when she brought Jennifer Lopez on stage.

Swift joined the singer for a duet version of Lopez’ "Jenny From the Block” at the Staples Center in Los Angeles. Nelly, Ellie Goulding, and Tegan and Sara are among the other guests that Swift has invited to surprise her fans.

Also read: Jennifer Lopez Returning to 'American Idol,' Says Drama-Free Boyfriend

As she was introducing J.Lo, Swift said the tune was her “hairbrush song.”

“You just blast it in your room and sing in front of your mirror into a hairbrush,” she explained to the crowd. “You had that one favorite song that was your favorite to dance to …”

Here’s the video. Grab your hairbrush: