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When Kate Middleton, the Duchess of Cambridge, wears something — virtually any item of clothing or accessory — it sells out in a minute. It's called the "Kate Middleton Effect," and it applies to everything from nude pantyhose to wedge sandals and simple, blue silk-jersey wrap dresses (like the one she donned at her engagement).

Kate Middleton's impact on fashion and trends is seriously impressive — but it seems as though she’s being usurped as the most influential royal by one of her children.

According to a new report from eBay, the royal with the biggest influence on search and sales is the tiny Princess Charlotte. The royal, who will soon become a big sister, is already becoming a fashion powerhouse.

Princess Charlotte Birthday Portrait Royal
Credit: HRH The Duchess of Cambridge via Getty Images

An eBay spokesperson told Hello!, "Her yellow cardigan worn in her birthday picture sparked the biggest percentage increase in searches for an item of clothing worn by any royal."

Charlotte made eBay’s traffic soar once more over the summer when she joined her parents on a royal tour of Germany. Then, eBay said, Charlotte had a six-fold search increase by people hoping to find her Liberty print smock dress. Her mother Kate, on the other hand, had only 37 searches for her dress from the same trip.

"It's the youngest generation of royals who really generate the must-have fashion items — and are driving a new generation of shopping behavior on eBay,” Murray Lambell, vice president of trading at eBay, told Hello!.

Still, Charlotte isn’t the only trend-setter coming up in the family. As the Huffington Postnoted, George is quite popular in the world of fashion, too, with fans going crazy for the adorable blue jumper he wore during the royal tour of Canada in 2016.

Even would-be royals like Meghan Markle appear to make a big impact on trends. AOL observed that everything she wore at the Invictus games (a pair of Mother ripped denim jeans, a white button-down shirt by Misha Nonoo, an Everlane tote, and Finlay and Co. Percy sunglasses) has sold out.

But as Vanity Fair explained, Middleton’s influence isn’t waning or going away anytime soon. According to eBay, we are all still collectively searching for her cobalt blue Saloni dress. And good luck finding one available anywhere in the world.

You can, however, buy it in fuchsia on Net-A-Porter — when it's back in stock, anyway.