Justin Bieber Surprises Selena Gomez on Stage During Her Live Show

Justin Bieber gave girlfriend Selena Gomez and her fans the surprise of their lives when he appeared on stage during Selena's performance at the O.C. Fair in Costa Mesa yesterday (July 24).

Bieber, who is known to love a good live show surprise, staged an impromptu performance at Selena's California gig. The star walked out onstage, mic in hand, and serenaded Selena, much to her and her unexpected fans' delight.

Bieber gave Gomez a big hug before launching into a musical medley, including his track 'Favorite Girl.'