James Middleton Mistaken For Jeremy Piven At ATP World Tour Finals [PHOTOS]

Pippa Promotes 'Celebrate'
Middleton's first book on party planning.
Pippa Middleton loves a good tennis match, and last night (November 12th) she cheered on Roger Federer at the Barclay’s ATP World Tour Finals.  Unfortunately, six-time champion Federer lost to Novak Djokovic at London’s 02 Arena.

Middleton was joined in Federer’s box by a few friends and brother James Middleton, who was mistaken for Jeremy Piven on Twitter.

That’s awesome. 

After the match, Middleton was snapped congratulating Djokovic.  According to our friends at style blog Pippa Middleton, Catherine’s younger sister wore a plum leather jacket with a French Connection leopard blouse, Goldsign jeans, Kate Spade booties and Loewe’s “Amazona” bag.