The O2 was a packed house of celebrities for the finals of the ATP World Tour Finals in London, featuring Novak Djokovic vs. Roger Federer. Ms. Pippa Middleton was there to celebrate with some friends and her brother, James, as were footballers Robert Pires and Francesco Totti.
So you think you can spectate? Cat Deeley could barely stand to watch when Djokovic tumbled to the ground and lost some blood in the process.
(Photos: Getty Images)