The couple were installed at the attraction two years ago to mark their first wedding anniversary, clothed in the outfits they wore to announce their engagement.
The Duke and Duchess of Cambridge, both 32, have now been re-dressed in evening wear, while the hair has been updated with the times.
The newly dressed wax figures were unveiled Wednesday.
Kate is wearing a full-length turquoise silk gown, while William, second in line to the throne, is dressed in a double-breasted black dinner suit.
“The figures have been in the attraction for two years now and we felt it was time to swap their engagement outfits for a glamorous evening look,” a spokeswoman told AFP.
The figures are the same but their hair has been altered in keeping with the real-life royals.
“The hair has been restyled and updated,” the spokeswoman said. “The duchess now has a chic half-up, half-down evening hairstyle. The duke’s hair has thinned since his figure was first made, so yes, so has our figure’s.”
The figures are placed in the royal zone, one of the most popular parts of the visitor attraction, along with other members of the House of Windsor.
Meanwhile a new painting of William titled “Fatherhood” was to be unveiled in London on Wednesday. William and Kate’s son Prince George was born on July 22 last year.
The oil-on-canvas portrait, measuring 90 by 60 centimeters, is by Dan Llywelyn Hall. It shows William in a dark suit and red tie looking upwards and to his left.
“‘Fatherhood’ is a portrait about a universal theme: the concerns, hopes and aspirations of a family man,” the 33-year-old artist said.
It depicts the prince wearing a poppy, in a nod to the 100th anniversary of the start of World War I.
The painting will be sold in October in aid of The Victoria Cross Trust and War Memorials Trust.
The duke and duchess were in the royal box on Wimbledon’s Centre Court on Wednesday, where they saw British defending champion Andy Murray crash out in the quarter-finals.
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