Sharing the exciting news on his Instagram page, Chris wrote, "Sweet Katherine, so happy you said yes! I’m thrilled to be marrying you. Proud to live boldly in faith with you. Here we go! 💍🙏♥️."
The proposal comes after their whirlwind romance was confirmed last July.
Chris has previously been married to actress Anna Faris, from 2008 until they announced their split in 2017. Since announcing the news, Anna has congratulated the pair.
"I’m so happy for you both!!” Congratulations!" the mother of his child, Jack, wrote on the Instagram photo.
Katherine shared the same engagement photo on her Instagram, writing, "My sweet love. Wouldn’t want to live this life with anyone but you ♥️💍"
A source previously revealed to People Magazine that the pair had grown really serious about each other very quickly.
They said: "They’re both serious about the relationship and hopeful for the future.
"Chris doesn’t just date to date, and neither does Katherine. She’s very excited."
Another source also added: "Chris and Katherine are very happy together.
"They’re very compatible and have a lot in common."
Congratulations to the happy couple!