Britney Spears Pictures

U.S. singer Madonna performs on stage, in front of a large image of Britney Spears, during her "Sticky and Sweet" tour at the Monumental stadium in Buenos Aires December 5, 2008. REUTERS/Marcos Brindicci (ARGENTINA)

Reuters

(L-R) AEG president Tim Leiweke, television personality Adam Carolla, Singer Britney Spears, council woman Jan Perry and Los Angeles Mayor Antonio Villaraigosa light a Christmas tree at the LA Live entertainment complex in Los Angeles, California December 4, 2008. REUTERS/Eric Thayer (UNITED STATES)

Reuters

(L-R) AEG President Tim Leiweke, television personality Adam Carolla, Singer Britney Spears, council woman Jan Perry and Los Angeles Mayor Antonio Villaraigosa light a Christmas tree at the LA Live entertainment complex in Los Angeles, California December 4, 2008. REUTERS/Eric Thayer (UNITED STATES)

Reuters

Singer Britney Spears, council woman Jan Perry and Los Angeles Mayor Antonio Villaraigosa light a Christmas tree at the LA Live entertainment complex in Los Angeles, California December 4, 2008. REUTERS/Eric Thayer (UNITED STATES)

Reuters

In this photo released by Warner Bros., talk show host Ellen DeGeneres, left, and pop singer Britney Spears go Christmas Caroling in Los Angeles, in a segment for "The Ellen DeGeneres Show," taped Friday, Dec. 5, 2008. This segment will air on Tuesday, Dec. 16. (AP Photo/Warner Bros., Michael Rozman) ** NO SALES **

AP

Singer Britney Spears, left, and comedian Adam Carolla at the LA Live entertainment complex holiday tree lighting ceremony in Los Angeles on Thursday, Dec. 4, 2008. (AP Photo/Dan Steinberg)

AP

From left to right, comedian Adam Carolla, singer Britney Spears, Los Angeles councilwoman Jan Perry, and mayor Antonio Villaraigosa are seen at the LA Live entertainment complex holiday tree lighting ceremony in Los Angeles on Thursday, Dec. 4, 2008. (AP Photo/Dan Steinberg)

AP

Singer Britney Spears makes an appearance at the LA Live entertainment complex holiday tree lighting ceremony in Los Angeles on Thursday, Dec. 4, 2008. (AP Photo/Dan Steinberg)

AP

Britney Spears and Adam Corrolla at the "Light of the Angels" christmas tree lighting ceremony at the Nokia Theatre on December 4, 2008 in Los Angeles, California.."Light Of The Angels".L.A. Live.Los Angeles, CA United States.December 4, 2008.Photo by Matthew Simmons/WireImage.com..To license this image (56311464), contact WireImage.com

WireImage.com

Britney Spears appears onstage at the "Light of the Angels" christmas tree lighting ceremony at the Nokia Theatre on December 4, 2008 in Los Angeles, California.."Light Of The Angels".L.A. Live.Los Angeles, CA United States.December 4, 2008.Photo by Matthew Simmons/WireImage.com..To license this image (56311459), contact WireImage.com

WireImage.com