Britney Spears Good Morning America Video

celebrated her 27th birthday on Good Morning America, after a whirlwind promotional tour in Europe last week.

Britney made her entrance on top of a giant cage and performed "Circus," from her sixth studio album of the same name, alongside clowns, jugglers and performers dressed as circus animals. She also performed "Womanizer."

Spears announced that she will kick off a 27-city North American tour, beginning in New Orleans on March 3, and wrapping it up in Chicago on April 28, before heading to London two play two dates.

Tickets go on sale Saturday, December 6 for The Circus Starring Britney Spears 2009 Tour.

For complete list of tour dates and ticket information click here.

Well, I just figured out what to get my daughters for Christmas. They will be super excited.

Check out Britney Spears Good Morning America video below.



Britney Spears performs Circus on GMA

Britney Spears performs Womanizer on GMA

View Britney's recent gorgeous photo shoot for Glamour magazine.