Britney Spears has had quite a week! Her documentary "For the Record" aired Sunday night on MTV and her new album "Circus" hits stores today! But that's not all. December 2 is also her 27th birthday! How is Brit celebrating? She kicked off the day performing on Good Morning America dressed as a ringmaster and entered Lincoln Center on top of a giant cage with clowns and jugglers. She performed "Circus" and "Womanizer" off her new album and announced the dates of her next world tour!

A celeb b-day is not complete without other stars sending their greetings. Brit received a bunch of "Happy Birthdays". Hugh Jackman, Reese Witherspoon and Taylor Swift, sent their love. Taylor even joked that she cried when she met Brit at the MTV Video Music Awards. Ms. Spears' parents were there to celebrate inside the tent, as well as her brother and her little boys Preston and Jayden, who held a sign that read "Happy Birthday, Britney!" Aw!

What do you think Brit is wishing for when she blows out those 27 candles? Leave your guess below!