Justin Bieber to Perform at Selena Gomez's UNICEF Concert

　　UNICEF ambassador Selena Gomez is ready to wow audiences with her benefit concert at the House of Blues in West Hollywood, Calif. tonight, and boyfriend Justin Bieber is rumored to be joining her on stage.

　　A Hollywood Life source said, "Justin will be a surprise guest at Selena's concert. UNICEF is really important to Selena and Justin knows this."

　　Selena has been an active ambassador for UNICEF for the last two years, traveling to Ghana and Chile and bringing awareness about the program's focus issues. Last March, she helped launch Celebrity Tap, which raised funds to help UNICEF provide water and sanitation programs in Togo, the Central African Republic and Vietnam.

　　This won't be the first time Justin has supported one of Selena's endeavors. The Canadian superstar showed up at the kick-off of his leading lady's 2011 summer tour, performing a mash-up of 'Favorite Girl' and Justin Timberlake's 'Cry Me a River.'

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