Justin Bieber and Taylor Swift sing together "Baby" in concert (Video)

Justin Bieber and Taylor Swift

Taylor Swift surprised an audience in Los Angeles on Tuesday night when he performed at the Staples Center a duet with Justin Bieber.

While teen idol sang his song 'Baby', Taylor Swift took the stage in a purple dress to sing. Both sounded great, as the crowd went wild.

As we know, Taylor Swift's best friend Selena Gomez is not surprising to join Justin Bieber , who is the star boyfriend, to sing one of his
favorite tunes.