Kate Middleton flaunted her post-baby body for the first time in her hometown of Anglesey, Wales on Monday.

After giving birth to Prince George Alexander Louis in July, the Duchess of Cambridge looked much thinner, revealing no signs of a baby bump.

Middleton, 31, left the newborn at home while she did some local shopping at Waitrose supermarket. In photos obtained by Us Weekly, she was dressed casually in a white and black striped shirt, black skinny jeans, flats and her hair pulled up in a ponytail.

See photos here:

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 Middleton family source tells Us Weekly. "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."

The first-time mom debuted little George outside the Lindo Wing of St. Mary's hospital, one day after giving birth on July 22.

In Prince William's first TV interview about his son's birth, he said George is growing "quickly.:

"He's a little fighter. He kind of, he wriggles around quite a lot. And he doesn't want to go to sleep that much, which is a little bit of a problem," William joked. "He's a little bit of a rascal, put it that way. So he either reminds me of my brother or me when I was younger. I'm not sure. But he's doing very well at the moment."

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Kate Middleton