Ida Mae Astute/ABC
  • Britney Spears

    Thousands of fans lined up Tuesday, Dec. 2, to see Britney Spears perform live on "GMA" under the big top at the Big Apple Circus. Spears was also celebrating her 27th birthday, and she gave her fans a gift by announcing she is kicking off a world tour on March 3 in her home state of Louisiana. <b><a href="http://abcnews.go.com/GMA/SpecialConcert/story?id=6371517" target="external">Click here for tour dates and ticket information</a></b>.
    Jessica DiPietro/ABC
  • Britney Spears

    Spears and her dancers, dressed as circus performers, staged a high-impact, intricately choreographed routine as she sang her No. 1 single, "Womanizer" and the title track from her "Circus" album. The concert extravaganza included jugglers, clowns, pyrotechnics, popcorn and cotton candy.
    Jessica DiPietro/ABC
  • Britney Spears

    Showing off toned abs in a midriff-baring top, curve-hugging black leather pants and then hot pants, it was clear the singer has spent time at the gym and the dance studio getting in shape before the concert tour.
    Jessica DiPietro/ABC
  • Britney Spears

    In September, Spears made a triumphant return to the 2008 MTV Video Music Awards, winning three Moonmen, including video of the year, best female video and best pop video for her hit "Piece of Me." On Nov. 6, she made a cameo appearance at the Dodger Stadium show of Madonna's Sticky & Sweet Tour. Midway through "Human Nature," Spears joined Madonna on stage.
    Jessica DiPietro/ABC
  • Britney Spears

    Britney's young sons, Jayden James and Sean Preston, her mom Lynne, and dad Jamie were at the "GMA" performance to cheer her on. Spears' first tour in five years, which kicks off in March 2009, will hit 27 cities with The Pussycat Dolls as special guests.
    Ida Mae Astute/ABC
  • Britney Spears

    Spears began her career as a teen pop sensation, who eagerly served up catchy bubblegum beats sure to get any prom party started. Since then, she has become a staple of the music scene with every release selling millions to the masses.
    Ida Mae Astute/ABC
  • Britney Spears

    Fans cheered wildly when Spears emerged from a circus wagon to start the show. Later, she crashed through a ring of fire during "Womanizer."
    Ida Mae Astute/ABC
  • Britney Spears

    Spears has wowed fans with her theatrical stage performances since she first hit the scene in 1998 &#151; the first of a bevy of blond-haired teen beauties which included Christina Aguilera, Jessica Simpson and Mandy Moore. She's sold 62 million albums worldwide and had nine No. 1 worldwide singles.
    Ida Mae Astute/ABC
  • Britney Spears

    Spears told Glamour magazine that the song "Womanizer" is a "really empowering song. There are so many guys who take advantage of girls and play girls all the time. The song is basically saying that we've got your number &#151; we know what you're up to." As for the album "Circus," she told the magazine, "It's really personal, and I think people will feel that when they hear it. It's me talking to them, instead of just singing a song about something."
    Ida Mae Astute/ABC
  • Britney Spears

    Diane Sawyer and Robin Roberts presented Spears with a six-tier, 40-inch-tall birthday cake from Carlo's Bakery in New York. Buddy Valastro spent 60 hours on the elaborate cake, decorated with the "Circus" theme in mind. The caked weighed nearly 300 pounds and was made with 40 pounds of butter, 40 pounds of cream cheese and 50 quarts of cake batter.
    Ida Mae Astute/ABC
  • Britney Spears

    Celebrities John Travolta, Reese Witherspoon, Nicollette Sheridan and Terri Hatcher taped birthday greetings for Spears' birthday that aired on "Good Morning America" during her performance. People's Sexiest Man Hugh Jackman serenaded the pop princess with his version of "Happy Birthday."
    Ida Mae Astute/ABC
  • Britney Spears

    Tickets for The Circus Starring Britney Spears tour go on sale Saturday, Dec. 6, but you can find out about pre-sale tickets at <b><a href="http://www.britneyspears.com/" target="external">www.britneyspears.com</a></b>.
    Ida Mae Astute/ABC
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