Justin Bieber Surprises Selena Gomez Onstage (VIDEO)

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Fans at Selena Gomez’s show Sunday night at the Pacific Amphitheatre in Costa Mesa, Calif. certainly got their money’s worth! While onstage in an adorable Mandalay sparkly pink dress, SelGo was greeted by a special, yellow-shirted visitor named Justin Bieber! The 17-year-old heartthrob greeted his girlfriend with a hug before beginning to sing “Favorite Girl.”

But that’s not all he sang!

Justin Biebs also sang a hit from Mr. J.T., Justin Timberlake! Check out SelGo’s guy covering “Cry Me a River.” 

Following the show, Justin wrote of his gal’s performance, tweeting:

[email protected] u did great tonight. proud of u.”

Selena turned 19 on Friday and probably spent the weekend with her beau celebrating. What do you think of this hot teen couple? Will they last? Sound off in the comments, and be sure to follow Celebuzz on TwitterFacebook and Tumblr to get the latest breaking celebrity news!