Sources say Kate Middleton's pregnancy pounds were virtually effortless to lose.

Kate Middleton's post-baby body was revealed when she went grocery shopping recently...and she looks like she never had a baby.

The Duchess of Cambridge, 31, has 'hardly done anything' to lose baby weight, a source close to the family said. The pounds just "melted off".

Just five weeks ago, Middleton gave birth to the newest royal, Prince George of Cambridge...and her body already looks virtually the same.

"You could hardly tell she had just given birth," a source close to the Middleton family said.

"Kate's still breastfeeding and the small weight she gained while pregnant has just melted off," the source added.

Kate was seen pushing a grocery cart around a Waitrose supermarket, with nary a hair of baby weight in sight.

The source added that the Duchess of Cambridge has "hardly done anything to lose the weight."

Kate isn't even dieting-she just has an incredible metabolism, apparently.

"She's not dieting. After giving birth, she did continue with her yoga."

How did Kate lose so much baby weight?! Sound off in the comments below!