The "Neighbors" actor and his longtime love are engaged after more than three years of dating, and the actress showed off her stunning engagement ring at the "Sleeping With Other People" screening on Monday night in Los Angeles.
The bride-to-be looked gorgeous at the event, pairing her new diamond sparkler with a white midi dress with black side panels and a mesh hemline. She completed her look with metallic sandals, tousled waves and a pretty pink lip.
Brie and Franco have stayed mum about their relationship status, and the two are rarely photographed together.
However, they were snapped sitting in the front row at the Dior Homme Spring/Summer 2016 fashion show in Paris in June.
We can't wait to finally see them hit the red carpet together -- congrats to the happy couple!