RIHANNA ANNOUNCES THE LAST GIRL STANDING TOUR WITH KE$HA & NICKI MINAJ!

Rihanna will hit the road this summer for her "Last Girl On Earth Tour" and she's tapped two of her famous lady friends to join her. Lil Wayne protégé Nicki Minaj and pop singer Ke$ha will be opening up for the Bajan singer on the trek, which kicks off July 2 in Seattle, Washington, and wraps up in Chicago on Aug. 25.

The 25-date tour will also make stops in Canada, Tampa, L.A., New York and Las Vegas. Tickets will go on sale at LiveNation.com on Friday (April 9). Additional dates will be announced soon.

The full list of tour dates for the "Last Girl on Earth tour" are:

7/2: Seattle, WA (White River Amphitheatre)
7/4: Vancouver, BC (General Motors Place)
7/6: Calgary, AB (Pengrowth Saddeldome)
7/9: Sacramento, CA (ARCO Arena)
7/10: Mountain View, CA (Shoreline Amphitheatre at Mountain View)
7/14: Albuquerque, NM (Hard Rock Casino Albuquerque presents The Pavilion)
7/15: Denver, CO (Comfort Dental Amphitheatre)
7/17: Las Vegas, NV (Mandalay Bay Events Center)
7/21: Los Angeles, CA (Staples Center)
7/22: Phoenix, AZ (Cricket Wireless Pavilion)
7/28: Atlanta, GA (Philips Arena)
7/30: Tampa, FL (Ford Amphitheatre)
7/31: Miami, FL (American Airlines Center)
8/3: Indianapolis, IN (Verizon Wireless Music Center Indianapolis)
8/5: Toronto, ON (Molson Canadian Amphitheatre)
8/7: Montreal, QC (Bell Centre)
8/8: Boston, MA (Comcast Center)
8/11: Uncasville, CT (Mohegan Sun Arena)
8/12: New York, NY (Madison Square Garden)
8/15: Wantagh, NY (Nikon at Jones Beach Theater)
8/18: Camden, NJ (Susquehanna Bank Center)
8/20: Bristow, VA (Jiffy Lube Live)
8/21: Hershey, PA (Hersheypark Stadium)
8/22: Detroit, MI (DTE Energy Music Theatre)
8/25: Chicago, IL (United Center)