Britney's 27th ‘Circus' Birthday

Britney Spears celebrated her 27th birthday doing what her fans love to see her do most — performing.

The pop star continued her comeback with an appearance on “Good Morning America” Tuesday morning at the Big Apple Circus tent at New York’s Lincoln Center.

VIEW THE PHOTOS: Britney’s ‘Circus’ Birthday

Britney, who was dressed as a ringmaster, made a grand entrance on a circus wagon with jugglers, clowns and performers in animal costumes accompanying her, before performing her hit single, “Womanizer.”

The pop star’s festive appearance coincides with the release of her sixth studio album, “Circus.”

VIEW THE PHOTOS: Britney Spears

“GMA” host Robin Roberts noted that Brit’s appearance was “our concert event of the year.”

Robin’s co-host, Diane Sawyer, agreed, saying, “There are about a gazillion people [here].”

The “gazillion” people included Brit’s sons, Preston and Jayden, and her mom, Lynne Spears and brother Bryan.

VIEW THE PHOTOS: Britney: The Way She Was

And it wasn’t only just family wishing Britney a happy birthday. During the broadcast, a slew of stars, including Taylor Swift, John Travolta, Nicollette Sheridan, Teri Hatcher, Reese Witherspoon and Hugh Jackman – who sang “Happy Birthday” to the pop star – sent well wishes to Britney via taped greetings.

“You look great,” Reese said to Brit, “and I hope you have a great day.”

Robin and Diane ended the celebration by surprising Brit with a circus-themed birthday cake.

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