Britney Spears attends The Intimate by Britney Spears presentation at the New York Public Library on Tuesday, Sept. 9, 2014 in New York. (AP Photo)
Britney Spears arrives at 2014 Elton John Oscar Viewing and After Party on Sunday, March 2, 2014 in West Hollywood, Calif. (AP Photo)
Britney Spears accepts the award for favorite pop artist at the 40th annual People's Choice Awards at the Nokia Theatre L.A. Live on Wednesday, Jan. 8, 2014, in Los Angeles. (AP Photo)
Singer Britney Spears arrives at the world premiere of "The Smurfs 2" at the Regency Village Theatre on Sunday, July 28, 2013 in Los Angeles. (AP Photo)
Britney Spears attends the "The X Factor" season finale results show at CBS Television City on Thursday, Dec. 20, 2012, in Los Angeles. (AP Photo)
Britney Spears at "The X Factor" Season 2 Premiere and handprint ceremony at Grauman's Chinese Theatre on September 11, 2012 in Hollywood, California. (AP Photo)
Singer Britney Spears arrives at KIIS FM's 2011 Wango Tango Concert at Staples Center on May 14, 2011 in Los Angeles, California. (AP Photo)
Woody, Britney Spears and Buzz Lightyear at the World Premiere of Disney/Pixar's "Toy Story 3" on June 13, 2010 at the El Capitan Theatre in Hollywood, California. (AP Photo)
Britney Spears accepts the ultimate award at the Teen Choice Awards on Sunday Aug. 9, 2009, in Universal City, Calif. (AP Photo)
Singer Britney Spears performs on ABC's "Good Morning America" show at the Big Apple Circus in New York on Tuesday, Dec. 2, 2008. (AP Photo)
In this Dec. 1, 2007 file photo, singer Britney Spears poses on the press line at the Scandinavian Style Mansion party in Los Angeles. (AP Photo)
Britney Spears performs at the MTV Video Music Awards held at the Palms Hotel and Casino on Sunday, Sept. 9, 2007, in Las Vegas. (AP Photo)
Britney Spears arrives for a post Grammy Awards party at a private residence Feb. 8, 2006, in Beverly Hills, Calif. (AP Photo)
Singer Britney Spears arrives for the film premiere of "Charlie and the Chocolate Factory," in this July 10, 2005 file photo, in Los Angeles. (AP Photo)
Britney Spears appears as a presenter during the Billbaord Awards at the MGM Grand Garden Arena in Las Vegas, Nev., Wednesday, Dec. 8, 2004. (AP Photo)
Pop star Britney Spears poses for photographers with her new star on the Hollywood Walk of Fame, Monday, Nov. 17, 2003, in Los Angeles. (AP Photo)
US pop star Britney Spears poses for photographers during a news conference in Cologne, Germany, Friday, March 8, 2002. (AP Photo)
Britney Spears performs with snake during the finale of the 2001 MTV Video Music Awards Thursday, Sept. 6, 2001, at New York's Metropolitan Opera House. (AP Photo)
Singer Britney Spears poses in front of the Eiffel Tower Friday May 5, 2000, in Paris. (AP Photo)
Singer Britney Spears smiles as she holds one of her four MTV awards at a photocall in Dublin, Ireland, Thursday, Nov. 11, 1999. (AP Photo)