What better way for Britney to celebrate her 27th birthday yesterday than to perform and receive a giant birthday cake on Good Morning America?!

Britney performed Womanizer and Circus, from her new album (also called Circus) for her birthday bash.

The massive yummy cake took 60 hours to make!!

Her Circus themed performance (filmed in a Big Top circus tent in New York) was watched by her little boys Jayden James and Sean Preston, dressed in old-fashioned clothes, complete with flat cap. How cute!

Britney's kids - Jayden James and Sean Preston

Here's the video of her performances and cake:

Check out her special birthday greetings from Hugh Jackman, Reese Witherspoon and Taylor Swift at 8:15!

What do you think - has Brit still got the wow factor?