 Complete the following phrase:  American singer Lady Gaga has embarked on five concert tours, becoming the fifth woman to pass the half-billion career total tour gross as per Billboard Boxscore. She has also performed live at various award ceremonies and television shows. Gaga promoted her debut single Just Dance through several performances, including Miss Universe 2008 and So You Think You Can Dance. She first served as an opening act for the boy band New Kids on the Block and the girl group The Pussycat Dolls, before beginning her own headlining tour, The Fame Ball Tour, which began in March 2009 and ended in September 2009. Following the canceled tour with rapper Kanye West, Gaga embarked on her second worldwide concert tour, The Monster Ball Tour. Staged in support of her extended play The Fame Monster 2009, the tour was critically acclaimed and grossed 227.4 million, making it one of the highest-grossing concert tours of all time. Gaga also performed songs from the album at award ceremoniesthe American Music Awards of 2009, 