While attending a tour of the Warner Bros. film studio in Leavesden, England, with her husband Prince William and brother-in-law Prince Harry, the mom-to-be opted for a polka-dot Topshop dress with Ralph Lauren jacket.
Despite the duchess being six months pregnant, the frock was not maternity wear, yet it still covered her growing baby bump perfectly. The $76 dress also managed to start a fashion frenzy. Within hours of her visit, the printed frock was completely out of stock online and in stores.
This isn't the first time the Duchess has caused clothing to sell out at warp speed. A MaxMara wrap dress flew off the shelves just hours after the brunette beauty donned it in February. Most famously, the blue Issa dress she when she announced her engagement in 2010 was so popular it continued to sell out even after the brand replenished the stock. Here's hoping Topshop restocks this dress—and fast!