Rihanna x Last Girl On Earth Tour. Rihanna will launch her first headline tour with “Last Girl On Earth” featuring Ke$ha and Nicki Minaj. The North American tour includes 25 shows, begins in Seattle July 2, Los Angeles on July 21, Madison Square Garden in N.Y.C. on Aug. 12 and ends August 25 in Chicago. Tickets go on sale April 9 check out Live Nation for more info.