Princess Charlene donned a pair of “faux” black leather-based trousers by Philipp Plein for the event.

These “faux leather skinny trousers” at present price £419 from Farfetch, after being made 30 p.c cheaper down from £598.

The description for these trousers says: “Characterised by the spirit of Rock’n’roll, Philipp Plein makes clothing for those looking to inject their wardrobe with a slightly darker edge.

“These black fake leather-based skinny trousers from Philipp Plein function a low rise, a waistband with belt loops, a button and zip fly, a 5 pocket design, a entrance emblem plaque, a silver-tone emblem plaque, ribbed particulars, a daily size and a dangling D-ring.”

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The faux leather trousers are very similar to a pair recently worn by Meghan Markle.

The Duchess of Sussex wore a pair of £975 black lamb leather trousers whilst recording an episode of her podcast Archetypes a few weeks ago.

Meghan posed with her podcast guest, comedian Ziwe Fumudoh, who posted the photograph on Instagram.

The “Becky Leather Trousers” cost a whopping £975, with the description saying: “The best-selling Becky Trouser is a tailor-made wardrobe staple crafted in unlined 100% lamb leather-based.

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“This pair features pleat detailing at the front, functional slant pockets, and a front zip opening with a hook and bar closure for a clean finish.

“The high-waisted Becky Trouser is reduce for a straight, subtly relaxed match that tapers barely on the ankle. Take your true measurement.”

Unlike Charlene’s trousers which were faux leather, Meghan opted for a pair made from real lamb leather, hence they were double the price.

The Princess of Monaco paired her trousers with a “PEKKA” black wool coat from the Swiss label Akris.

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Instagram user @adriennedeneuilly said: “Seeing them collectively by no means fails to place an enormous smile on my face.”

Similarly, @thoralisen said of Charlene: “Love her!!!”

Another royal watcher @hamasana added: “A fantastic and exquisite princess, I like her very a lot.”

Finally, @paraguayana commented: “She’s so stunning.”