Jennifer-Lopez-and-Taylor-Swift*Jennifer Lopez joined country/pop star Taylor Swift at her concert in Los Angeles for a rendition of “Jenny from the Block.” [Scroll down to watch.]

Swift was performing at the Staples Centre on her Red Tour when J.Lo joined her on stage. Swift announced Lopez by asking the crowd, “So I’m just wondering, Los Angeles, how would you feel if there was a special surprise guest?”

Lopez’s performance marked the end of Swift’s four night run in Los Angeles.

Before J.Lo emerged, Swift said to the audience, “Now I don’t know about you, but when I was little, you know you had that favorite song that you used to play over and over and over again? Just blast it in your room? And you’d sing in front of your mirror into a hairbrush, right? …Los Angeles, this is my hairbrush song.”