In some teaser images shared by Netflix, the 24-year-old British actress can be seen as a stunning double in a strapless lilac evening gown, similar to one Princess Diana wore back in 1983.
She's depicted surrounded by photographers on a red carpet, close to a tuxedo-clad Prince Charles (played by Josh O'Connor), along with another shot of her waving to the cameras.
Another shot shows Corrin in a trademark Princess Diana matching two-piece set that showcases her famed engagement ring.
"The Emanuels, who designed the original, gave us the patterns, and then it was made for me," she said. "We were filming the scene when you first see her in the wedding dress—I think it was Lancaster House in London—and I had a team of about 10 people helping me put it on, because it's massive."
She also revealed that during her initial fitting that the whole crew fell speechless at the breathtaking resemblance.
"I walked out and everyone went completely silent," she said.
In a hint of what's in store for viewers when the new season hits Netflix in November, Netflix also showed a glimpse of Corrin meeting Camilla Parker-Bowles, her character's future love-rival, played Emerald Fennell.
Wearing a similar outfit, she offers Parker-Bowles a close-up look at the dazzling sapphire ring and we're already feeling the tension.
In a statement made by Anderson after her role was announed last year she wrote, "I am so excited to be joining the cast and crew of The Crown and to have the opportunity to portray such a complicated and controversial woman."
"Thatcher was undoubtedly formidable, but I am relishing exploring beneath the surface and, dare I say, falling in love with the icon who, whether loved or despised, defined an era," she continued.
The fourth series will dramatise the turbulent plight of the royal family throughout the late '70s and early '80s.
Other images shared by Netflix show Queen Elizabeth, played by Olivia Coleman and Prince Phillip, played by Tobias Menzies, attending the Royal Variety Performance, as well as miscellaneous scenes that further depict Erin Doherty as Princess Anne and Helena Bonham Carter as Princess Margaret.
Erin Doherty is pictured in an exact replica of a dress that Princess Anne has worn both back in the '80s and to a wedding in 2008.
Helena Bonham Carter makes her return as Princess Margaret, who will be portrayed as a far removal from the wild child she was in previous seasons.
For everything else we can expect to see in the upcoming season, debuting on November 15, head here.