The Sun reports that A-list pals Eddie Redmayne and Tom Hanks attended.
The duo has been together since 2015 and has been notorious private during their three years together.
The Uninvited film director reportedly popped the question last May, according to Us Weekly.
The Star Wars: Rogue One star was spotted flashing a diamond sparkler on the red carpet in June 2017 but she never confirmed the engagement.
“I am definitely romantic and I love romantic stories — that’s why I keep making romantic movies,” she told the publication. “It’s funny how seeing a love story never gets boring because it’s the dream isn’t it? It’s the dream to have a true connection with another human being.”