Princess Kate Plays Monster on Secret Play Date with Prince George – in Matching Mommy-and-Me Outfits!

"She was flailing her arms about and chasing him," an onlooker tells PEOPLE

Photo: John Stillwell/WPA Pool/Getty

It’s not every day that a princess pretends to be a monster.

In her first public sighting since welcoming Princess Charlotte on May 2, Princess Kate visited London’s Holland Park last weekend with her 22-month-old son, Prince George, where she joined the ranks of moms to play that time-honored (and tiring!) game of chase: monster.

On Sunday morning, a playful Kate, 33, was spotted entertaining her rambunctious toddler at the picturesque park, a 10-minute drive from the family’s residence at Kensington Palace.

“It looked like she was pretending to be a monster, flailing her arms about and chasing him,” an onlooker tells PEOPLE exclusively.

“She was play-acting just like all mums do and he was running around loving it – he looked very happy,” the onlooker adds.

Fashion-wise, the pair were sweetly in sync for the cold, wet morning: “They had matching waxed-green coats on, similar to a Regatta [brand], and dark jeans with boots. They both looked matching!”

With Prince William getting ready for a starry polo match and one-month-old Princess Charlotte nowhere to be seen, George was clearly enjoying having his mommy all to himself.

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

As for Kate’s antics, it reminded the observer of a certain Disney film. “It was a bit like Monsters, Inc.,” says the park-goer. (We’re thinking more along the lines of Shrek‘s Princess Fiona.)

The observer also adds that Kate showed no sign of newborn exhaustion: “They both looked really well.”

It’s hardly the first private play date for the two: They were also spotted having fun on the swings near the family’s country home, Anmer Hall.

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