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OTRC: Britney Spears drops 'Till The World Ends' remix featuring Nicki Minaj, Ke$ha

Britney Spears is pictured in this undated photo, posted on her Facebook page. / Nicki Minaj appears at the Grammy Awards on Feb. 13, 2011. (facebook.com/britneyspears / Nicki Minaj's official website - mypinkfriday.com)

Britney Spears has released a "Femme Fatale" remix of her single "Till the World Ends," featuring her upcoming tour partner, Nicki Minaj, and pop singer Ke$ha.

The singers had teased the song on their Twitter page last week. The remix is now available on iTunes and on Spears' website.

The original version of "Till The World Ends," from Spears' new album "Femme Fatale," was released in March. Her remix marks Spears' second collaboration with a top female pop artist over the past few months. Spears also recently recorded a remix of R&B and pop singer Rihanna's song "S&M."

Meanwhile, Minaj and Spears hung out together at an after party for Minaj's performance at the Staples Center in Los Angeles on Friday, April 22.

Spears confirmed earlier this month that Minaj will join her on her all-female tour this summer.

Beginning in June, Spears, 29, is set to perform concerts across the United States and Canada to promote "Femme Fatale," her seventh major record.

"This is the Femme Fatale tour and I'm thrilled to have Nicki Minaj, Jessie and the ToyBoys, and Nervo join me and get everyone on the dance floor," Spears said in a statement released on Tuesday, April 12. "Can't wait to take the Femme Fatales on the road."

Tickets are set to go on sale on April 30. Jessie and the ToyBoys is headed by electronic pop singer Jessie Malakouti. Nervo is made up of electronic dance singer-songwriters and twins Miriam and Olivia Nervo.

Check out Britney Spears' tour dates below.

June 16, 2011 - Sacramento, CA, Power Balance Pavilion
June 18, 2011 - San Jose, CA, HP Pavilion
June 20, 2011 - Los Angeles, CA, Staples Center
June 24, 2011 - Anaheim, CA, Honda Center June 25, 2011 - Las Vegas, NV, MGM Grand
June 28, 2011 - Portland, OR, Rose Garden Arena
June 29, 2011 - Tacoma, WA, Tacoma Dome
July 1, 2011 - Vancouver, BC, Rogers Arena
July 4, 2011 - Winnipeg, MB, MTS Centre
July 6, 2011 - St. Paul, MN, Xcel Center
July 8, 2011 - Chicago, IL, United Center
July 12, 2011 - Dallas, TX, American Airlines Center
July 13, 2011 - Houston, TX, Toyota Center
July 15, 2011 - New Orleans, LA, New Orleans Arena
July 17, 2011 - Atlanta, GA, Philips Arena
July 20, 2011 - Orlando, FL, Amway Center
July 22, 2011 - Miami, FL, American Airlines Arena
July 26, 2011 - Cleveland, OH, Quicken Loans Arena
July 28, 2011 - Detroit, MI, Palace of Auburn Hills
July 30, 2011 - Philadelphia, PA, Wells Fargo Center
July 31, 2011 - Washington, DC, Verizon Center
August 2, 2011 - Uniondale, NJ, Nassau Coliseum
August 5, 2011 - East Rutherford, NJ, Izod Center
August 8, 2011 - Boston, MA, TD Garden
August 11, 2011 - Montreal, QC, Bell Centre
August 13, 2011 - Toronto, ON, Air Canada Centre

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