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STAR’S WILD AND WACKY HAT HARD TO TOP: STYLISTS

She’s the mad hatter!

Sarah Jessica Parker channeled her quirkiest Carrie Bradshaw – topping off her look with an acorn- and garden-inspired headpiece from famed British milliner Philip Treacy – at Sunday’s world premiere of “Sex and the City: The Movie” in London.

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The hat came complete with flower, grass and a pair of butterflies. Thankfully, there were no squirrels.

“This is the fashion equivalent of getting a master’s at Harvard. Seriously. There is no awkwardness, no discomfort. It’s costume-y, but it’s costume-y in the most fabulous way,” says celebrity stylist Robert Verdi of Parker’s headwear.

“Sarah is one of the only people that can make sense of fashion when it’s elevated to art,” he added. “I think it would look crazier in the US than it does there. I think it looks fabulous.”

The 43-year-old star took to the red carpet in a custom Alexander McQueen celery-colored silk tulle bustier dress with peacock trim. With it, she wore iridescent green patent-leather peep-toe pumps, a green crocodile clutch and Fred Leighton jewels including a 1930s 75-carat diamond corsage bracelet and diamond drop earrings.

“I thought it was pretty fabulous of it to take a risk and totally appropriate because the premiere was in London. In New York, it would be too quirky and too over the top,” says Julia Topolski, accessories director at Lucky Magazine.

“But I think she played it really well . . . And I’m sure she didn’t take it too seriously herself.”

raakhee.mirchandani@nypost.com