Video: Justin Bieber & Taylor Swift perform “Baby”

Check out this video of Justin Bieber and Selena Gomez performing a duet.

At Taylor’s concert in LA, Justin surprised the crowd by joining her on stage for a performance of his hit single, Baby.

It may have been Taylor’s show, but the crowd were delighted to see J-Biebs.

This isn’t the first time Justin has crashed a gig – he has also performed alongside rumoured girlfriend Selena Gomez at one of her shows. Check out the video above.