LONDON, ENGLAND - JULY 18: Pippa Middleton attends The Frost family final Summer Party to raise money for the Miles Frost Fund in partnership with the British Heart Foundation on July 18, 2016 in London, England. (Photo by David M. Benett/Dave Benett/Getty Images for British Heart Foundation)

LONDON, ENGLAND - JULY 18:  Pippa Middleton attends The Frost family final Summer Party to raise money for the Miles Frost Fund in partnership with the British Heart Foundation on July 18, 2016 in London, England.  (Photo by David M. Benett/Dave Benett/Getty Images for British Heart Foundation)