Nicki Minaj Officially Joins Britney Spears 'Femme Fatale' Tour

Here are Britney Spears' previously announced tour dates:

June 17: Sacramento, Ca. (Power Balance Pavilion)
June 18: San Jose, Ca. (HP Pavilion)
June 20: Los Angeles, Ca. (Staples Center)
June 24: Anaheim, Ca. (Honda Center)
June 25: Las Vegas, Nev. (MGM Grand)
June 28: Portland, Oreg. (Rose Garden Arena)
June 29: Tacoma, Wash. (Tacoma Dome)
July 1: Vancouver, B.C. (Rogers Arena)
July 4: Winnipeg, M.B. (MTS Centre)
July 6: St. Paul, Minn. (Xcel Center)
July 8: Chicago, Ill. (United Center)
July 12: Dallas, Tex. (American Airlines Center)
July 13: Houston, Tex. (Toyota Center)
July 15: New Orleans, La. (New Orleans Arena)
July 17: Atlanta, Ga. (Philips Arena)
July 20: Orlando, Fla. (Amway Center)
July 22: Miami, Fla. (American Airlines Arena)
July 26: Cleveland, Ohio (Quicken Loans Arena)
July 28: Detroit, Mich. (Palace of Auburn Hills)
July 30: Philadelphia, Pa. (Wells Fargo Center)
July 31: Washington, D.C. (Verizon Center)
Aug. 2: Uniondale, N.Y. (Nassau Coliseum)
Aug. 5: East Rutherford, N.J. (Izod Center)
Aug. 8: Boston, Mass. (TD Garden)
Aug. 11: Montreal, Quebec (Bell Centre)
Aug. 13: Toronto, Ont. (Air Canada Centre)