When Kate Middleton wears a brand, it quickly sells out.
The fashion phenomenon has been dubbed, "The Duchess Effect."
While Middleton is also a fan of high-fashion favorites like Burberry and Stella McCartney, much of her wardrobe is purchased on High Street.
From Zara to J Brand, see the labels that she's boosting sales for.
Zara
Even with a baby bump, Kate Middleton has shown her love for this up-and-coming brand.
The royal sweetheart reportedly wore a Zara cape out on the town during a London shopping trip this week, and she's been known to sport Zara dresses, tops and jeans to everything from children's charity plays to Olympic events.
A lacy Zara shift she wore to a charity event in December sold out on the website within hours.
LK Bennett
Another sell-out, this time in shoes.
Kate Middleton's well-known LK Bennett nude heels have become an online sensation, with a company executive noting the platforms are by far the brand's best-sellers.
Middleton wore the heels again and again this summer at weddings, birthdays and during a cross-country Canadian tour. The publicity spurred a shoe shopping spree for the UK accessory chain.
Prabal Gurung
The duchess shot this brand to online fame after donning one of its floral frocks to a meeting with the president of Singapore.
The Prabal Gurung dress was sold out in less than an hour, helping to rocket the brand to fame during fall's New York Fashion Week.
The designer shared his excitement on Twitter.
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