Britney Spears: Later, London!

Britney Spears, her father Jamie Spears and the rest of her entourage depart Heathrow airport in London on Sunday en route to the Big Apple.

The pop princess will be celebrating her 27th birthday in New York City on Tuesday, bringing in the big day with a performance inside Lincoln Center’s Big Apple Circus tent for Good Morning America.

Other pictures include Britney on the latest cover of Glamour and backstage/behind-the-scenes during her X-Factor performance in the UK.

Check out the vid below of Britney celebrating her b-day at nightclub G-A-Y!