After several days of rumors and being " in talks," Nicki Minaj was officially confirmed as the special guest on Britney Spears upcoming Femme Fatale tour today, via a post on Spears' official website. The tour begins on June 16 in Sacramento, Calif., and is scheduled to wrap on August 13 in Toronto.

The tour's all-female lineup will also include Jessie J and the Toy Boys and Nervo on every tour stop. Tickets for select markets go on sale beginning April 30 at Ticketmaster.com and LiveNation.com. Citi cardmembers will also have access to presale tickets through Citi's Private Pass Program.

"This is the 'Femme Fatale' tour and I'm thrilled to have the hot Nicki Minaj join me and Jessie and the Toy Boys and Nervo will get everyone on the dance floor," Spears said in a statement. "Can't wait to take the Femme Fatales on the road."

Enrique Iglesias was originally scheduled to be the tour's special guest,  but - as exclusively reported by Billboard.biz -- pulled out just hours after Spears made the announcement on "Good Morning America."

"Femme Fatale" debuted at No. 1 on the Billboard Top 200 last week, marking Spears' sixth chart-topping album.

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)