Kate Middleton turned heads when she debuted her slim figure just a few weeks after giving birth to Princess Charlotte, triggering interest towards her fitness program.

Celeb Dirty Laundry reported that the Duchess flaunted her post-baby body the trooping the Colour birthday parade where she and Prince William brought Prince George. It was earlier announced that Kate Middleton's maternity would be cut short. Her appearance at the event was an indication that she has already recuperated from giving birth, and her glow was a statement that she is ready as ever to once again be the Royal family's representative in numerous official functions.

Kate Middleton seemed eager to go back to the public scene as she and Prince George also made an appearance at the Festival of Polo charity tournament. The Duchess' fitness was witnessed by attendees as she walked around the lawn and played with Prince George without any nanny intervening or helping her.

With most mothers struggling to lose the extra pounds they've gained throughout their pregnancy, many may be asking: what is Kate Middleton's fitness regimen which allowed her to lose the extra weight in just a few week's time?

People said a top London trainer whose top clientele include A-listers, royals and executives reportedly worked with Kate Middleton throughout her pregnancy to monitor her fitness. "It's a lot of money, but you get a lot for the price," a royal insider reportedly said. "The trainer checks in remotely with Kate by phone every day as well as seeing her in person once a week."

A healthy diet is also reportedly part of Kate Middleton's royal fitness regimen. The 33-year-old mother of two chooses to feast on organic fruits, vegetables and lean meats. It has also been previously reported that the Duchess is a fan of fruit and vegetable juices and smoothies.