Pippa Middleton: ATP World Tour with Brother James!

Pippa Middleton and her brother James attend the men’s singles final match between Roger Federer and Novak Djokovic during day eight of the ATP World Tour Finals held at O2 Arena on Monday (November 12) in London, England.

The 29-year-old sister and 25-year-old brother of Catherine, Duchess of Cambridge seemed to have a great time while they watched Novak win the match.

PHOTOS: Check out the latest pics of Pippa Middleton

Pippa‘s new party planning book “Celebrate: A Year of Festivities for Families and Friends” is in stores now. Make sure to pick up a copy!