Since giving birth to royal baby Prince George, Kate Middleton has surprisingly slimmed down quicker than expected. However, Prince William's wife was recently spotted at the fast food restaurant McDonald's.

According to E! News, the Duchess of Cambridge was en route to Kensington Palace after leaving Anglesey in Wales with Prince George and a nanny when she pulled over into the eatery's parking lot.

Situated in the driver's seat Middleton emerged from the vehicle wearing a green jacket paired with dark skinny jean and flats. The Duchess wore her hair in a messy high ponytail and was all smiles as she made her way through the parking lot.

[For a photo of Kate Middleton at McDonald's click HERE]

Middleton made her first official public appearance post baby Prince George on August 30th in Wales looking as if she lost every ounce of baby weight. Apparently the Duchess is very conscious about her body and is staying active in an effort to slim down.

The royal attended the race in Angelsey wearing Paige skinny jeans and a fitted Ralph Lauren blazer over a Zara top.

Entertainment Wise reported that "According to Park Warden Will Stewart, the Duchess admitted she was working on getting her slender figure back." Middleton was focused on keeping active at the marathon event.

Stewart told The Telegraph, "She seemed genuinely interested in doing some walking. Especially after the baby, she wants to get back into shape."

A source close to the family told Us Weekly, "She's hardly done anything to lose the weight . . . She looks incredible."

The insider added, "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."

Even though McDonald's isn't the healthiest place to eat perhaps Middleton was celebrating the fact that she, Prince William, and Prince George are in the process of moving into their newly renovated 20-room Apartment 1A at Kensington Palace which is expected to be finished this month.

What are your thoughts on Kate Middleton's post-baby body? Leave us a comment below.