Schwarzenegger later posted the same photo to her account, adding a message to her new fiancé: "My sweet love. Wouldn't want to live this life with anyone but you."

Photos first turned up in tabloids mid-last year of Jurassic World star Pratt, 39, and Schwarzenegger, 29, who is the daughter of '80s blockbuster star and former California governor Arnold Schwarzenegger and journalist Maria Shriver.

Their courtship was chronicled on social media and through paparazzi pics: church dates, ice cream runs, and meet-the-fam dinners.

It will be the first marriage for Schwarzenegger, an author, and the second for Pratt, who split from actress Anna Faris in 2017. The former couple has a 6-year-old son.