Britney's back in America from her whirlwind European media tour to continue promoting her brand new album at home. Watch her first time performance of "Circus" and of her hit song "Womanizer" live on today's Good Morning America.

Today marks the release of her highly anticipated new album 'Circus' which is set to coincide with her 27th birthday. Check out the HUGE cake she got!

Happy Birthday gurl!! All the best for the upcoming year!!

If you're a fan make sure to go out and support her new album by purchasing it at your favourite music store or buying online HERE.