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Singer Christina Aguilera arrives at the 13th Annual Elton John Aids Foundation Academy Awards Viewing Party at the Pacific Design Center on February 27, 2005 in Los Angeles, California. (Photo by Stephen Shugerman/Getty Images)
1999Teen pop star, Christina Aguilera at The Wherehouse store to promote her new CD. The song 'Genie In A Bottle,' has reached #1 on the Billboard Hot 100 Singles. (Photo by Brenda Chase/Online USA, Inc.)
1999Christina Aguilera arrives at the 1999 MTV Music Video Awards held at the Metropolitan Opera House, Lincoln Center in New York City on September 9, 1999. (Photo by Frank Micelotta/ImageDirect)
1999Pop Singer Christina Aguilera Performs At Halftime November 21, 1999 At The Mls Cup Between The Los Angeles Galaxy And D.C. United At Foxboro Stadium In Foxboro, Massachusetts. (Photo By Matthew Stockman/Getty Images)
2000Christina Aguilera reacts as she accepts her Grammy for Best New Artist at the 42nd annual Grammy Awards at the Staples Center in Los Angeles Wednesday, Feb. 23, 2000. (AP Photo/Kevork Djansezian)
2000Pop stars Britney Spears, left, and Christina Aguilera introduce Whitney Houston at the 2000 MTV Video Music Awards Thursday, Sept. 7, 2000, at Radio City Music Hall in New York. (AP Photo/Suzanne Plunket
2000Christina Aguilera performs on TRL at the MTV studios in New York City. (Photo by Scott Gries/ImageDirect)
2001Pop diva Christina Aguilera arrives at the 43rd Annual Grammy Awards February 21, 2001 at the Staples Center in Los Angeles, CA. (Photo by Chris Weeks/Liaison)
2001Singer Christina Aguilera after she won Favorite Female Artist of the Year at the 7th Annual Blockbuster Entertainment Awards at the Shrine Auditorium in Los Angeles, CA., Tuesday, April 10, 2001.(photo by Kevin Winter/Getty Images)
2001Singer Christina Aguilera blows a kiss for photographers as she arrives for the 2001 MTV Movie Awards in Los Angeles, Saturday, June 2, 2001. The winners for the awards show, scheduled to air June 7, were chosen through a national poll of MTV viewers. (AP Photo/Kevork Djansezian)
2002Pink, Christina Aguilera and Mya hold their awards after winning for best pop collaboration with vocals for the song "Lady Maramalade" from the movie "Moulin Rouge" at the 44th annual Grammy Awards, Wednesday, Feb. 27, 2002, in Los Angeles. (AP Photo/Reed Saxon)
2002Christina Aguilera arrives at Radio City Music Hall for the MTV Video Music Awards in New York, Thursday, Aug. 29, 2002. (AP Photo/Tina Fineberg)
2002Christina Aguilera arrives at the VH1 Big In 2002 Awards held at Grand Olympic Auditorium in Los Angeles, CA., December 4, 2002. (Photo by Frank Micelotta/ImageDirect)
2003Christina Aguilera performing at the 30th Annual AMAs held at the Shrine Auditorium in Los Angeles, CA, January 13, 2003. (Photo by Kevin Winter/ABC/Getty Images)
2003Singers Britney Spears(L), Madonna, and Christina Aguilera perform onstage during the 2003 MTV Video Music Awards at Radio City Music Hall on August 28, 2003 in New York City. (Photo by Scott Gries/Getty Images)
2003Singer Christina Aguilera poses at the Art's Hotel on October 21, 2003 in Barcelona. Christina is to host the 10th MTV Europe Music Awards 2003 in Edinburgh on 6th November. (Photo by Getty Images)
2004Christina Aguilera holds the award for best female pop vocal performance award for "Beautiful" from her "Stripped" album at the 46th Annual Grammy Awards, in Los Angeles. (AP Photo/Reed Saxon)
2004Singer Christina Aguilera, wearing a leather dress, performs during DSquared's mens' fashion collection for the spring-summer 2005, unveiled in Milan, Italy. (AP Photo/Antonio Calanni)
2005Singer Christina Aguilera arrives at the 13th Annual Elton John Aids Foundation Academy Awards Viewing Party at the Pacific Design Center on February 27, 2005 in Los Angeles, California. (Photo by Stephen Shugerman/Getty Images)
2005Christina Aguilera, left, and Eva Longoria arrive for the US Weekly Young Hollywood Hot 20 party at LAX in the Hollywood section of Los Angeles, Calif. (AP Photo/Phil McCarten)
2005Singer Christina Aguilera performs in concert at the Coca-Cola Dome ahead of the F1 GP Masters race in Kyalami on November 10, 2005 in Johannesburg, South Africa. (Photo by Clive Rose/Getty Images)
2006Singer Christina Aguilera arrives for the Entertainment Weekly's annual celebration of their "must list" summer issue. (AP Photo/ Louis Lanzano)
2006Christina Aguilera arrives at the 2006 MTV Movie Awards in Culver City, Calif. (AP Photo/Matt Sayles)
2006Christina Aguilera arrives to the 2006 MTV Video Music Awards in New York. (AP Photo/Stephen Chernin)
2007Singer Christina Aguilera poses with her Grammy for Best Female Pop Vocal Performance for 'Ain't No Other Man' in the press room at the 49th Annual Grammy Awards at the Staples Center on February 11, 2007 in Los Angeles, California. (Photo by Vince Bucci/Getty Images)
2007U.S. singer Christina Aguilera performance during her "Back to Basics" tour in Bangkok, Thailand. (AP Photo)
2007Singer Christina Aguilera poses on the red carpet at the nationwide launch of Rock The Vote 2008 held at Kitson on November 13, 2007, in Beverly Hills California. (Photo by Toby Canham/Getty Images)
2008Singer Christina Aguilera poses on the press line at the opening gala celebration of the Broad Contemporary Art Museum at LACMA in Los Angeles. (AP Photo/Dan Steinberg)
2008Singer Christina Aguilera arrives at the 2008 MTV Video Music Awards at Paramount Pictures Studios in Los Angeles, California. (Photo by Frederick M. Brown/Getty Images)
2008Recording artist Christina Aguilera poses for photographers during an autograph session and the launch of her new perfume 'Inspire' at Macy's Glendale Galleria in Glendale, California. (Photo by Frederick M. Brown/Getty Images)
2009Singer Christina Aguilera arrives at LG Rumorous Night with Heidi Klum held at the Andaz Hotel on April 28, 2009 in West Hollywood, California. (Photo by Michael Buckner/Getty Images)
2009Christina Aguilera arrives at Variety's 1st Annual Power of Women Luncheon at the Beverly Wilshire Hotel in Beverly Hills, California. (Photo by Jason Merritt/Getty Images)
2010Presenter Christina Aguilera poses at the 67th Annual Golden Globe Awards. (AP Photo/Mark J. Terrill)
2010Christina Aguilera sings the national anthem before Game 7 of the NBA basketball finals between the Los Angeles Lakers and the Boston Celtics. (AP Photo/Jae C. Hong)
2010Cher and actress/singer Christina Aguilera arrive at the premiere of Screen Gems' 'Burlesque' at Grauman's Chinese Theater on November 15, 2010 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)
2011Singer Christina Aguilera performs during the Bridgestone Super Bowl XLV Pregame Show at Dallas Cowboys Stadium on February 6, 2011 in Arlington, Texas. (Photo by Christopher Polk/Getty Images)
2011Singer Christina Aguilera arrives at NBC's press conference for the their new Show 'The Voice' on March 15, 2011 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)
2011Christina Aguilera performs at the 'Michael Forever Tribute Concert' at Millennium Stadium on October 8, 2011 in Cardiff, Wales. (Photo by Tim Alban/Getty Images)
2012The Voice's Christina Aguilera attends the NBCUniversal's 'The Voice' Press Junket and cocktail reception on August 12, 2012 in Los Angeles, California. (Photo by Christopher Polk/Getty Images for NBCUniversal)
2012Singer Christina Aguilera (L) and Matt Rutler attend the Samsung Galaxy Note II Beverly Hills Launch Party on October 25, 2012 in Los Angeles, California. (Photo by Jason Merritt/Getty Images for Samsung)
2012Singer Christina Aguilera and rapper Pitbull perform onstage during the 40th American Music Awards held at Nokia Theatre L.A. Live on November 18, 2012 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)
2013Singer Christina Aguilera arrives at the screening of NBC's 'The Voice' Season 4 at TCL Chinese Theatre on March 20, 2013 in Hollywood, California. (Photo by Kevin Winter/Getty Images)
2013Rapper Pitbull (L) and singer Christina Aguilera perform during the 2013 Billboard Music Awards at the MGM Grand Garden Arena on May 19, 2013 in Las Vegas, Nevada. (Photo by Ethan Miller/Getty Images)
