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Pippa Middleton Watches The Mens Singles Final At The ATP World Tour Finals, At The O2 Arena In London, Sunday, Nov. 27, 2011

Pippa Middleton, sister of Kate, Duchess of Cambridge, watches the mens singles final between Roger Federer of Switzerland and Jo-Wilfried Tsonga of France at the ATP World Tour Finals, at the O2 arena in London, Sunday, Nov. 27, 2011.