Taylor Swift Surprises Crowd with Jennifer Lopez Duet! Watch Here!
Swift introduced the "American Idol" judge by saying,“You know how you have your favorite song that you just play over and over again in your room?”
As the crowd cheered, the songstress continued, “And you sing it in front of your mirror into a hairbrush? And you have that favorite song to dance to? Los Angeles, this is my hairbrush song.”
JLo then emerged and the duo began singing the 2002 hit in front of the frenzied audience at the Staples Center. Check out the performance in the player below!