Justin Bieber Joins Selena Gomez Onstage

'Had a #greatnight and surprised the people,' Bieber tweeted after California show.

Selena Gomez played a show on Sunday night at the Pacific Amphitheatre in Costa Mesa, California. And mid-concert, her fans got a big surprise as Gomez's beau, Justin Bieber, took the stage.

Video posted on

href="http://www.celebuzz.com/2011-07-25/justin-bieber-surprises-selena-g

omez-onstage-video/" target="_blank">Celebuzz.com shows Bieber giving his lady love a big hug before launching into an acoustic version of Justin Timberlake's classic breakup ode, "Cry Me a River." He also reportedly sang "Favorite Girl."

Bieber even took to

target="_blank">Twitter to tell Gomez that he thought she did a great job onstage. "Had a #greatnight and surprised the people. felt good to be on stage. nothing is changing that. #REAL," he wrote.

"@selenagomez u did great tonight. proud of u."

[article id="1667633"]Bieber, who recently revealed[/article] that he was taking a bit of a summer break, also added that as nice as it was to be onstage again, he is even more enthusiastic about the [article id="1667554"]new album[/article] he's working on.

"More excited than ever to get back in the studio and make this #newalbum," he wrote. "Miss the tour and want to give u all new music.

#BELIEVE I do this because i love music. #REAL."

Earlier in the weekend,

href="http://hollywoodcrush.mtv.com/2011/07/22/selena-gomez-birthday/">Go

mez celebrated her 19th birthday and offered a big "thank you" to her fans on Twitter. "HappyBirthdaySelena is a trending topic," she wrote. "Thank you all so much for a great birthday. Thank you to everyone who sent birthday wishes, I love you all."