Three years on, Pippa is sharing her tips to help us all achieve a pert bottom.
In her first Mind & Body column for Waitrose Weekend, the keen sportswoman reveals her exercise routine. The good news is, Pippa also makes us all feel a bit better about ourselves by admitting she loves chocolate, crisps and wine! Hurrah!
Apparently the secret to a good bod is moderation, portion control and exercise.
"I grew up with a belief that good health is about moderation in all things, so I'll be celebrating healthy living through exercise, and a little of the naughty stuff sprinkled in - I'm talking chocolate, crisps and the occasional glass of wine," Pippa says.
"I've never done Dukan, attempted Atkins or exercised religiously seven days a week but I do believe in making healthy choices - keeping refined carbs such as white bread and pasta to a minimum, and sticking to sensible portion sizes."
Now back to the booty. Pippa swears by four key exercises - ladders, pile squats, wall pushes and the classic plank, as they are "quick and great for toning all over."
Oh, and you'll need to make these workouts a regular thing. Pippa tries to exercise at least three - but ideally five - times a week.
Hate doing plank? Try this alternative...