Justin Bieber made a surprise appearance at girlfriend Selena Gomez's concert on Sunday night.
The 'Baby' singer arrived on stage unannounced at the OC Fair in Costa Mesa, CA, where Gomez was performing with band The Scene on their summer tour.
Bieber briefly hugged Gomez - who then walked off stage - before singing a medley of 'Favourite Girl' and Justin Timberlake's 'Cry Me A River'.
Watch Justin Bieber perform at Selena Gomez's concert below:
Bieber later wrote on his Twitter account: "Had a #greatnight and suprised the people. felt good to be on stage. nothing is changing that. #REAL (sic)."
He added in a separate message to Gomez: "U did great tonight. proud of u."
Gomez's appearance at the OC Fair came following her 19th birthday celebrations on Friday. She was reportedly treated to an outing to Disneyland by Bieber, who had earlier written on Twitter: "Happy Birthday @SelenaGomez gonna be a special day."
Wizards of Waverly Place star Gomez, who recently released third album When The Sun Goes Down, had previously predicted that her 19th birthday would be a "boring" occasion.
"I didn't really ask for anything, so I'm basically just going to be at tour rehearsal during the day," she told E! Online. "Maybe [I'll] go to dinner at night with my family. Pretty boring."
Selena Gomez & The Scene will perform in Pasa Robles, CA tonight.
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