Kate & Pippa Middleton: Friend's Wedding!

Kate and younger sis Pippa Middleton attend their friend’s wedding on Saturday (June 11) in Berkshire, England.

The Duchess of Cambridge, 29, and Pippa, 27, both in black hats and pumps, watched their pal, jockey Sam Waley Cohen, and bride Bella Ballin tie the knot.

Princess Beatrice and her boyfriend, Dave Clark, also attended the ceremony.

Earlier in the day, Kate joined Prince William in celebrating Queen Elizabeth‘s birthday during the Trooping the Colour ceremony in London.

10+ pictures inside of Kate and Pippa Middleton attending a friend’s wedding.