Just call them T. Lo.
Taylor Swift, who has set a new Staples Center concert record, surprised Los Angeles attendees last night with a special guest performer from the Bronx:
"You know how you have your favorite song that you just play over and over and over again," Swift said by way of introduction. "You just blast it in your room and you'd sing in front of your mirror into a hairbrush, right? You have that one favorite song. It was your favorite song to dance to. Los Angeles, this is my hairbrush song."
Watch the famous pair launch into a duet of "Jenny from the Block."
At another Los Angeles show, Swift sang "Brave" with Sara Bareilles.