After 2.5 years of dating, the Stranger Things actress made it seem official this morning that she and Jake are getting married.
She uploaded a cute picture of herself being hugged by her new fiancé while announcing the news to her 62.7 million followers.
The picture appears to show off an engagement ring that sparkles.
I've loved you three summers now, honey, I want 'em all, she wrote in the caption of the monochromatic image, which was from Taylor Swift's song "Lover."
The engagement was first hinted at by Jake, the 20-year-old son of Bon Jovi
Who posted a similar pair of photos of himself and Millie on his own Instagram page this morning with the simple but heartfelt caption, "Forever."
Fans have been quick to congratulate the duo in the comments sections of their respective posts.