Happy Birthday Brit Brit !!!!!!

Britney Spears kicked off her 27th birthday today by performing two songs on Good Morning America.

No interview — just performing.

Said Diane Sawyer: “We can’t wait to have her back sometime to talk with us. but this morning it is all about the music!”

With endless screaming fans in the circus tent, Brit bared a lot of her toned tummy, playing ringmaster as she tentatively danced and “sang” Circus.

Her mom Lynne and her two sons, who wearing matching newsboy caps, were also on hand.

After her second number, Womanizer, Sawyer and Robin Roberts presented booty short-wearing Britney with a cake. They announced her tour would start on March 3 and said, “Where will it start?” Britney seemed a little confused, answering, “Where?” Diane said, “At home?” She said, “Yes, in America.” Then Diane clarified: “New Orleans.”

Britney was over the moon when Hugh Jackman sang Happy Birthday to her in a clip. “Oh my god! That’s awesome! Thank you!” she said. In other clips, Reese Witherspoon said, “Happy 27, you look great and hope you have a great day.” And Taylor Swift said, “I absolutely love you. … You have officially been awesome for 27 years.”

Faded Youth