Celebrity Princess Diana Kristen Stewart Shows off Princess Diana's Engagement Ring in New Photo From 'Spencer' Fall 2021 can't come soon enough. By Isabel Jones Isabel Jones Instagram Twitter Isabel is an Oregon-born and Brooklyn-based writer and editor with a special interest in pop culture. InStyle's editorial guidelines Published on March 25, 2021 @ 02:06PM Pin Share Tweet Email Pablo Larraín's Princess Diana biopic, Spencer, is truly the gift that keeps on giving — and filming hasn't even wrapped. The movie, set for a fall 2021 release, stars Kristen Stewart as the late princess and centers on a weekend over the holidays in 1991 in which Diana decided to leave Prince Charles. The latest still from the film shows Stewart in a bold-shouldered plaid blazer and patterned off-white blouse, her short blonde locks tousled in the quintessential "Diana" style. Stewart looks into the camera with a half-smile on her face, a replica of the Princess of Wales's iconic sapphire engagement right poised on her left finger. NEON As you might know, Diana's oval-cut ring now resides on Kate Middleton's finger (though it was initially in Prince Harry's possession following his mother's death). When Diana selected the Garrard piece from a variety of rings, the royal family was reportedly disappointed that she'd chosen a design that was also available to the public at the time (though it came with a $60,000 price tag). Everything The Crown Got Right (and Wrong) About Princess Diana Our first glimpse at Stewart as Diana came in late January and featured another strong shoulder moment with a red blazer and a veiled black hat. Courtesy of Pablo Larraín Honestly, who even needs a movie at this point? These stills will feed us for years to come.