VIDEO/NEWS: Rihanna Announces "Last Girl on Earth" U.S. Tour with with Nicki Minaj & Ke$ha

-Source [RihannaNow]
Rihanna will be going on tour with Ke$ha and Nicki Minaj in North America this summer! Tickets will begin to go on sale April 9th at LiveNation.com.
NYC Fans: Rihanna will be performing at MSG on Aug 12 and Jones Beach on Aug 15.