http://www.babble.com/CS/blogs/famecrawler/archive/2008/12/02/gma-video-britney-rings-in-birthday-with-circus-performance.aspxHappy 27th Birthday to Britney Spears! She sang and danced her debut of Circus on Good Morning America and then performed Womanizer . She was later presented with a giant "Circus" cake and announced she would be kicking off her 2009 tour inenCommunityServer 2007.1 (Build: 20910.1126)