It's been one month since Kate Middleton gave birth to her second child, and a new report says that she was spotted having fun outdoors.

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On Wednesday, People reported that the Duchess of Cambridge was at London's Holland Park where she was playing a little game with her son, George. The site says that Middleton was pretending to be a monster as she chased her little boy around.

"She was play-acting like all mums do and he was running around it loving it," a witness said. "He looked very happy."

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While Middleton's husband, Prince William, was preparing for a polo match and their newborn daughter, Charlotte, was elsewhere, the mommy and son had their own bonding time together.

"He looked like such a happy lad, being chased by his mom and enjoying the swings, slides, roundabouts- they were going on everything," the source said. "They looked just like any other mom and toddler."

The Duchess of Cambridge and her son also apparently dressed well on their playdate with genuine fashion.

"They had matching waxed-green coats on, similar to a Regatta [brand], and dark jeans with boots," the insider revealed. "They both looked matching!"

The report also says that Middleton showed no sign of newborn exhaustion and that she and George looked "really well."

The royal family's latest addition Princess Charlotte was brought into the world on May 2. Prince George will celebrate his second birthday this July.

Tags: Kate Middleton Prince William Prince George