SYDNEY, AUSTRALIA - APRIL 21: Singer Beyonce Knowles performs on stage at the opening night of her "B'day" world tour at the Acer Arena on April 21, 2007 in Sydney, Australia. Returning to Australia to perform her own headline concert for the first time since 2005, the singer and actress plays the first night globally of her solo world tour to accompany her second album. (Photo by Paul McConnell/Getty Images)
