Scottish model and entrepreneur Rebecca Donaldson has opened up about her relationship with Formula 1 driver Carlos Sainz during a recent interview at the 2026 Miami Grand Prix. The couple has been linked romantically since the summer of 2023, and Donaldson took the opportunity to share her thoughts on Sainz’s distinctive personal style.
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During her conversation with the fashion publication “What People Are Wearing,” Donaldson was quick to name Sainz as the best-dressed driver in Formula 1. “This is an easy one,” she commented, affirming her boyfriend’s sartorial skills. “Obviously Carlos Sainz, and obviously because I buy his clothes,” she added with a laugh, illustrating the influence she has on his fashion choices.
As the Grand Prix weekend unfolded, Sainz sported a range of casual outfits that reflected the lively Miami atmosphere. On Sprint Day, he opted for a striking look that combined a classic white team shirt with a vibrant tropical shirt featuring a palm tree print, reminiscent of a Miami sunset. This was complemented by tan shorts and fashionable accessories, including a backwards baseball cap in a matching print, sunglasses, and a stylish wristwatch. Completing the ensemble, Sainz chose white sneakers and tube socks adorned with yellow stripes.
Donaldson, too, showcased her fashion sense during this high-profile event. She wore a chic outfit comprising a tan top and a brown skirt from Frankie Shop, paired with a coordinating clutch from The Row. Her vintage Chanel sunglasses and an eye-catching Audemars Piguet watch rounded off her ensemble. The watch, in particular, garnered much attention, with Donaldson noting that she had received numerous compliments throughout the weekend.
In addition to her relationship and fashion choices, Donaldson shared thoughts on her favourite beauty products. Among them was a particular L’Oreal lip gloss that she mentioned as a recent staple in her daily routine. “It’s really nice and super affordable,” she said, highlighting her preference for accessible beauty options.
The romance between Donaldson and Sainz first came to light in June 2023 when they were spotted together in Milan, although they maintained a low-key approach, refraining from public displays of affection. Since confirming their relationship, Donaldson has been a familiar face at various races around the globe, cheering on the Williams Racing driver.
While Donaldson’s Instagram feed primarily showcases her modelling career, she occasionally shares personal snippets of her life with Sainz. In September, for instance, she posted a photo of the racing star enjoying a leisurely day by the water, providing fans with a glimpse into their relationship.
Besides her work in modelling, Donaldson is also an entrepreneur. She founded her activewear brand, Muse Activewear, in October 2020, aiming to deliver a line of comfortable and supportive gym wear that can transition effortlessly into everyday attire. Her entrepreneurial spirit reflects her ambition to create a brand that resonates with customers seeking both style and utility.
As the couple continues to navigate their relationship in the public eye, Donaldson’s supportive role at races underscores their strong connection. Her insights into Sainz’s style reveal not just her admiration for him as a partner, but also her passion for fashion and commitment to her own career ambitions.