In an Instagram post, Chris said: "Sweet Katherine, so happy you said yes!"
The news came after Pratt went on a double date with Schwarzenegger's dad, Arnold, and his girlfriend Heather Milligan.
The post also featured a picture of the couple embracing and Schwarzenegger wearing an engagement ring. Proud to live boldly in faith with you.
The Parks and Recreation actor announced the news via Instagram this morning, stating that he was "thrilled" to be marrying the author.
Pratt and ex Anna Farris announced that they were splitting in summer of 2017 following eight years of marriage. I've cherished our time together.
Hollywood star Chris Pratt is to marry again. The actor was married for nearly a decade to actress Anna Faris with whom he shares a son, 6-year-old Jack. "Thankful for the laughs, kisses, talks, hikes, love, and care." .