Rihanna Will Hit the Road with Ke$ha

04/05/2010 AT 05:00 PM EDT

Talk about girl power: This summer, Rihanna will take her smash album Rated R on the road for her "Last Girl On Earth" North American tour. She'll also be joined by up and coming pop star Ke$ha.

The ladies, along with rapper Nicki Minaj, will kick it off in Seattle July 2, and make 25 total stops – including Los Angeles on July 21 and Madison Square Garden in N.Y.C. on Aug. 12 – ending August 25 in Chicago.

Tickets go on sale at LiveNation.com on April 9.

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