UNICEF ambassador Selena Gomez is set to throw a benefit concert at the House of Blues in West Hollywood today and Justin Bieber will join her on stage. It won't be the first time Bieber has made a surprise appearance at one of his girlfriend's shows. The "Baby" singer shocked both Selena and her fans when he surprisingly stepped onto the stage during one of her summer concerts and proceeded to serenade her. He is definitely a devoted boyfriend.
