Kate Middleton Wore 4-Inch $750 Jimmy Choo Heels at Tuesday Event

Catherine, Duchess of Cambridge arrives for a dinner hosted by The Thirty Club at Claridges on May 8, 2012 in London, England.  Samir Hussein/WireImage

Just like her bag collection and her wardrobe, Kate Middleton has given her shoe collection a luxe, high-fashion upgrade.

On Tuesday at a dinner hosted by The Thirty Club in London, the Duchess showed some leg in a chic ivory Roland Mouret dress with a thigh-high slit. While her attire was simple but stunning, her feet were decked out in glittered Jimmy Choo "Vamp" heels.

The platform sandals, which boast a 4.5-inch heel, retail for $750 — a few hundred more than her conservative everyday shoes, $325 L.K. Bennett nude pumps.

Jimmy Choo Shoe
Jimmy Choo

Middleton, 30, first stepped out in the dazzling statement heels when she attended the BAFTAs in L.A. when she and Prince William were doing their North American tour in July. She wore the fancy footwear with a gorgeous lilac Alexander McQueen gown.

Kate Middleton
Catherine, Duchess of Cambridge Kevork Djansezian/Getty Images at the Belasco Theatre on July 9, 2011 in Los Angeles, California.

As for her Roland Mouret dress, the French designer told Grazia this week that he is over the moon and humbled by her fashion choice.

"I am absolutely delighted that The Duchess of Cambridge chose to wear my Lombard gown to the Thirty Club annual dinner," Mouret told Grazia. "The Duchess has an elegance and timeless beauty that is a breath of fresh air, it is an honor to be part of her journey."

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