Lady GaGa is a pop singer and songwriter. She has sold an estimated 23 million albums and 64 million singles worldwide. The Fame Ball Tour was her debut concert tour, staged in support of her album The Fame. The second worldwide concert tour by Lady Gaga was The Monster Ball Tour. It ultimately grossed a total of US $227.4 million, from 200 reported shows, drawing an estimated audience of 2.5 million. In 2012, Gaga embarked on the Born This Way Ball Tour, in support of her second studio album Born This Way.