Among the celebrities sighted at the Las Vegas Grand Prix on Saturday night was Rihanna. 

The 35-year-old musician also made an effort to separate out from the throng by donning a $400k ANKLE watch by Jacob & Co.

Wrapped around her ankle and set in 18K white gold, the custom watch, which would have little trouble telling the time, was adorned with almost 70 carats of round and emerald-cut diamonds.

She stepped outdoors wearing it over a pair of sparkling black Balenciaga leggings that were fastened to high boots.

For more than ten years, Rihanna has maintained a close relationship with jeweler Jacob & Co. 

She wore a $670,000 watch and choker from the same brand at Pharrell Williams’s Louis Vuitton Fashion Show back in June.

The piece, according to GQ, was an 18-karat gold Flying Tourbillon set with 339 baguette diamonds on a bespoke calfskin strap embossed with alligator. 

The watch has a 42-hour power reserve and a hand-wound movement.

At the time, Jacob & Co. stated: “Rihanna decided she would wear a watch in a completely different way for the fashion event.”

“She brought the idea to Jacob & Co., as she had done numerous times in the past.”

Rihanna attended the Grand Prix, which was won by racer Max Verstappen, with celebrities such as Cara Delevingne, Heidi Klum, Brad Pitt, Paris Hilton, and David Beckham.

The course featured the second-longest straightaway in Formula 1 history, 1.2 miles, along Las Vegas Boulevard, popularly known as The Strip.

Wearing a low-cut blouse, tight satin leggings, and a leather jacket, Rihanna accessorized with dark hues and a striking red lip.

She was accompanied on their trip in the paddock by her 35-year-old lover, A$AP Rocky.