Presenting the future lady of House Jonas!
While walking in the city of love, the 21-year-old actress, best known for playing Sansa Stark on Game of Thrones, wore a black top, a mid-length matching jacket, a dark green plaid skirt, black thigh-high boots, a black and white beret bearing the word "Anarchy" and her pear-shaped diamond engagement ring and matching eternity band.
Spread Pictures / BACKGRID
Sophie's engagement ring is estimated to weigh three carats and is estimated to have cost between $25,000 and $30,000.
She and the 28-year-old singer had used a photo the two holding hands, with her sporting the rings, to announce their engagement on Instagram on Sunday.
"I said yes," she wrote.
"She said yes," Joe wrote.
Sophie and Joe have been dating since at least late last fall and have largely kept their relationship private.
Last month, they appeared to adopt a Siberian Husky puppy together.