The 30-year-old heiress credits the body conditioning regime for her more slender, toned figure, as well as following a healthy eating plan.
She said: "I've been working out and eating healthier and it feels great.
"I've been doing Pilates to help keep my body toned and cardio in the gym.
"I'm also eating a lean diet with lots of organic fruits, veggies and vitamin juices. I have so much energy and feel amazing."
Todd Phillips since splitting from Cy Waits in June - says she is "very happy" with her life at the moment and is enjoying the summer.