Though Kate Middleton looked much thinner during her first official appearance on Aug. 30, only five weeks after giving birth to Prince George, the slim down is a conscious effort to lose all her baby weight. 

According to reports, the 31-year-old Duchess of Cambridge is eager to lose all of her baby weight. 

Park Warden Will Stewart admitted that she was working the new mom to get her slender figure back.

"She seemed genuinely interested in doing some walking. Especially after the baby, she wants to get back into shape," he told The Telegraph. It's great that Kate is focusing on staying active and keeping healthy rather than concentrating on a specific weight to get down to."

Despite wanting to keep her figure slim, sources said that Middleton hasn't really exercised or dieted since she gave birth.

"She's hardly done anything to lose the weight . . . She looks incredible," a source close to the Middletons said. "Kate's still breastfeeding and the small weight she gained while pregnant has just melted off. She's not dieting. After giving birth, she did continue with her yoga."

Enstars reported last week that Middleton looked great at the Ring O'Fire Ultra Marathon in Anglesey, Wales.

The Duchess was a surprise to the guests that attended, as her original first public appearance was scheduled to be at the inaugural Tusk Conservation Awards on Sept. 12, where she was also to appear with Prince William.

"Initially the Duchess wasn't going to attend but she was also keen for the chance to thank the people of Anglesey herself for the warmth and hospitality they have shown her and the Duke," a source told Mail Online.