Justin Bieber Surprises Taylor Fans at L.A. Show

Teen pop star joins Taylor onstage to do his hit song “Baby.”

Ya know something wild would happen at the first of four Taylor Swift concerts in Los Angeles.

That something wild came in the form of a 17-year-old pop star: Justin Bieber popped up during Taylor's sold-out show at Staples Center, and the two sang his smash hit "Baby.”

“You think you’ve heard LOUD screaming in your life,” Taylor tweeted. “Then @justinbieber comes out and does a surprise song during your show. Woah. Unreal.”

Justin apparently had fun. He tweeted, “@taylorswift13 we should do that more often. :) great show! #muchlove.”

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