Taylor Swift & Jennifer Lopez - Jenny From The Block - Red Tour - Video

Taylor Swift surprised fans and brought out returning American Idol judge, Jennifer Lopez to perform Lopez's hit "Jenny From the Block" at the Los Angeles stop of Swift's Red Tour.

Photo: Christopher Polk/Getty Images
Tay-Swizzle told fans, "When I was a little girl, you know you have that favorite song that you just would play over and over and over again in your room, just blast it in your room—and you’d sing in front of your mirror into a hair brush… Los Angeles, this is my hair brush song!"

Sang Jenny From the Block with @JLo tonight at Staples Center. STILL FANGIRLING OUT ABOUT IT.

— Taylor Swift (@taylorswift13) August 25, 2013

@taylorswift13 had so much fun with you tonight!!! #RedTourLA #jennyfromtheblock #hairbrushsongs

— Jennifer Lopez (@JLo) August 25, 2013