Britney Spears
Britney Spears, a VMAs veteran, speaks onstage during the 2015 MTV Video Music Awards at Microsoft Theater on Aug. 30, 2015, in Los Angeles.
Britney Spears
Singer Britney Spears poses in the press room during the Teen Choice Awards 2015 at the USC Galen Center on Aug. 16, 2015, in Los Angeles.
Britney Spears
Britney Spears accepts the Choice Style Icon Award onstage during the Teen Choice Awards 2015 at the USC Galen Center on Aug. 16, 2015, in Los Angeles.
Britney Spears and Charlie Eberso
Singer Britney Spears and her then boyfriend Charlie Ebersol attend the 2015 Billboard Music Awards at MGM Grand Garden Arena on May 17, 2015, in Las Vegas, Nevada.
Britney Spears
Britney Spears rehearses "Britney: Piece of Me" at Planet Hollywood Resort & Casino on Thursday, Dec. 26, 2013, in Las Vegas.
Britney Spears
Britney Spears attends "The X-Factor" Finalists Party in Los Angeles on Nov. 5, 2012.
Britney Spears
Singer Britney Spears attends the 2013 Elton John Oscar Party in West Hollywood, Calif. on Feb. 24, 2013.
Britney Spears
Singer Britney Spears performs on ABC's "Good Morning America" in San Francisco on Sunday, March 27, 2011. The performance, which will air on March 29, was to promote her seventh studio album, "Femme Fatale."
Britney Spears
Britney Spears tapes a performance for ABC's "Good Morning America" at the Bill Graham Civic Auditorium in San Francisco on Sunday, March 27, 2011.
Britney Spears
Britney Spears tapes a performance for ABC's "Good Morning America" at the Bill Graham Civic Auditorium in San Francisco on Sunday, March 27, 2011.
Britney Spears
Britney Spears performs "Big Fat Bass" inside Rain Nightclub at Palms Casino Resort in Las Vegas on March 25, 2011, for an MTV special to air the following week.
Britney Spears
Britney Spears performs "Til the World Ends" inside Rain Nightclub at Palms Casino Resort in Las Vegas on March 25, 2011, for an MTV special to air the following week.
Britney Spears
Singer Britney Spears, right, and Jason Trawick arrive at the 52nd Annual Grammy Awards on January 31, 2010, in Los Angeles.
Britney Spears
Britney Spears arrives at the 2009 Teen Choice Awards on Aug. 9, 2009, in Universal City, Calif.
Britney Spears
Singer Britney Spears arrives at the 2009 Teen Choice Awards held at Gibson Amphitheatre on Aug. 9, 2009, in Universal City, Calif.
Britney Spears
Singer Britney Spears performs onstage during the opening night of "The Circus Starring Britney Spears" tour at the New Orleans Arena on March 3, 2009, in New Orleans.
Britney Spears
Singer Britney Spears, left, and host Adam Carolla speak on stage at the "Light of the Angels" Holiday Tree Lighting Ceremony on Dec. 4, 2008, in Los Angeles.
Britney Spears
Singer Britney Spears, left, and TV anchor Diane Sawyer appear on ABC's "Good Morning America" at The Big Apple Circus tent at Lincoln Center on Dec. 2, 2008, in New York.
Britney Spears
Britney Spears performs at the Bambi Awards 2008 Show on Nov. 27, 2008, in Offenburg, Germany.
Britney Spears
Madonna, with special guest Britney Spears, performs during her Sticky and Sweet Tour at Dodger Stadium on Nov. 6, 2008, in Los Angeles.
Britney Spears
Singer Britney Spears poses with the Best Female Video Award, Best Pop Award and Video of the Year Award for "Piece of Me" in the press room at the 2008 MTV Video Music Awards at Paramount Pictures Studios on Sept. 7, 2008, in Los Angeles.
Britney Spears
US pop star Britney Spears arrives at the Los Angeles County Superior courthouse on Jan. 14, 2008, for a hearing regarding visitation rights for her two sons that she has with ex-husband Kevin Federline.
Britney Spears
Britney Spears performs at the MTV Video Music Awards held at the Palms Hotel and Casino on Sunday, Sept. 9, 2007, in Las Vegas. In what appeared to be the most talked about performance of the night, Spears looked bleary, out of shape and unprepared.
Britney Spears
Britney Spears performs at the MTV Video Music Awards held at the Palms Hotel and Casino on Sunday, Sept. 9, 2007, in Las Vegas.
Britney Spears
Britney Spears climbs over a booth as she leaves the 50 Cent record release party at The Hard Rock Casino in Las Vegas, Saturday, Sept. 8, 2007.
Britney Spears
Then-married singers Britney Spears and Kevin Federline appear backstage at the 8th Annual Teen Choice Awards at the Gibson Amphitheatre on Aug. 20, 2006, in Universal City, Calif. The married in 2004 and divorced in 2007. They have two children together.
Britney Spears and Kevin Federline
Britney Spears and her now ex-husband Kevin Federline arrive at the 2006 Grammy Nominees party with Kanye West, hosted By Verizon Wireless and Rolling Stone Magazine at the Avalon Hollywood, on Feb. 6, 2005, in Hollywood, California.
Britney Spears
In this photo released by CBS, pop singer Britney Spears shares a laugh with host David Letterman on the set of "The Late Show with David Letterman" May 9, 2006, in New York. Spears announced on the show that she and husband Kevin Federline were expecting their second child.
Britney Spears
Louisiana native Britney Spears throws some beads from a French Quarter balcony in New Orleans on Monday Feb. 27, 2006.
Britney Spears
Singer Britney Spears arrives at a party for the 2006 Grammy nominees with Kanye West, hosted By Verizon Wireless and Rolling Stone Magazine, at the Avalon Hollywood, on Feb. 6, 2006, in Hollywood, Calif.
Britney Spears
A pregnant Britney Spears arrives at the premiere of Warner Bros. Picture's "Charlie and the Chocolate Factory" at the Chinese Theater on July 10, 2005, in Los Angeles.
Britney Spears
Singer Britney Spears and husband Kevin Federline kiss as they arrive at the 2004 Billboard Music Awards on December 8, 2004, at the MGM Grand Garden Arena, in Las Vegas, Nevada. The two were married in a private ceremony in 2004. Spears' first marriage, to childhood friend Jason Alexander, was annulled after two days.
Britney Spears
Britney Spears performs on the Mall in Washington during "NFL Kickoff Live 2003," Sept. 4, 2003, in Washington.
Britney Spears
Singers Britney Spears and Madonna share a kiss onstage during the 2003 MTV Video Music Awards at Radio City Music Hall on Aug. 28, 2003, in New York.
Britney Spears
Singer Britney Spears and actor Will Ferrell share a laugh onstage during Nickelodeon's 16th Annual Kids' Choice Awards in Santa Monica, Calif., April 12, 2003.
Britney Spears
Britney Spears, nominated for multiple awards, arrives for the MTV Video Music Awards at New York's Radio City Music Hall, Aug. 29, 2002.
Britney Spears
Singer Britney Spears, right, and her sister, Jamie Lynn Spears, joke as they present at the Teen Choice Awards 2002 in Los Angeles, Aug. 4, 2002.
Britney Spears
Britney Spears performs at Foro Sol Saturday July 27, 2002, in Mexico City.
Britney Spears
Britney Spears, right, who starred in the film "Crossroads," shares a laugh with her then-boyfriend Justin Timberlake of the pop group 'N Sync at the premiere of the film at the Grauman's Chinese Theater in Hollywood, Feb. 11, 2002.
Britney Spears & Justin Timberlake
Britney Spears and her then boyfriend, singer Justin Timberlake arrive backstage at the 28th Annual American Music Awards, Jan. 8, 2001, in Los Angeles.
Britney Spears
Britney Spears performs with a snake during the finale of the 2001 MTV Video Music Awards, Sept. 6, 2001, at New York's Metropolitan Opera House.
Britney Spears
Singer Britney Spears rehearses for the MTV Video Music Awards at New York's Lincoln Center on Sept. 8, 1999.
Britney Spears
Britney Spears smiles for the cameras during the 26th annual American Music Awards held at the Shrine Auditorium in Los Angeles, Jan. 11, 1999.