Although December 2 officially marks Britney Spears’ 27th birthday, her fans were the ones celebrating this morning. After a free mini-concert in New York City (you can see the video from Good Morning America above), the singer officially announced her plans for a 2009 tour with The Pussycat Dolls.

Beginning March 3, Spears will kick off the 27-city (there’s that number again) North American Circus tour in New Orleans. Tickets don’t officially go on sale until Saturday, but a simple password from the singer’s website can help you get them now.