Obviously these pics were taken by a concert goer but they're still viewable and worth looking at nonetheless. LOL! During her concert stop at the Staples Center in Los Angeles on Sunday, Beyonce was surprised on stage by several special guests. Jay-Z joined his long-time girlfriend onstage during her Upgrade U number, while Bey's fellow band mates, Kelly Rowland and Michelle Williams reunited with Beyonce center stage as she performed Survivor, complete with costumes. Coincidentally, Beyonce used this particular tour stop to record footage for her upcoming The Beyonce Experience DVD. Later on during the show, Rowland and Williams returned to the stage to present their leader with a big birthday cake before serenading her with the 'Happy Birthday' song. Beyonce turns 26 years old on September 5...I think...oh, whatever. In the meantime and in between time, you all can check out the video of Bey's backup singing to her as well as view more pictures after the jump.