Josh Lucas has tied the knot - at The Vatican

Brianna captioned an Instagram carousel from their special day: "Mr. and Mrs. Incredibly blessed to receive this sacrament together inside the heart of the Catholic Church and holy city."

Josh gushed in the comments section: "I love you! Easily one of the greatest days of my life. I am so so grateful."

Upon announcing their engagement last July, the Yellowstone actor admitted he was "grateful and thrilled" that Brianna had agreed to be his wife after he popped the question during a romantic vacation to Italy.

The happy couple - who had been together for almost two years - shared their happy news on Instagram.

In one clip, Brianna cried with happiness as she showed off her diamond ring while musicians played Elvis Presley's Can't Help Falling in Love.

Josh captioned his post: "For the last 2 years in Every Way and Every Day this beautiful soul has made me and my life better, deeper, and more whole.

"I am so grateful and thrilled she said 'Yes'. I WAY love you Brianna. Thank You to our families and all the people and places that made this come true. I am absolutely aware I got crazy lucky. (sic)"

Meanwhile, Brianna admitted accepting Josh's proposal was the "easiest and best question" she'd ever answered.

She wrote on her own page: "Almost 2 years ago this fall, and with no expectations, Josh walked into my life.. and we knew almost immediately we had each found our person in a way we've never experienced- on every level. This was the easiest and best question I've ever answered. So, here's to forever with my love, my best friend [heart emoji] I can't wait to keep living this life with you [prayer emoji]"

Josh - who has 13-year-old son Noah with ex-wife Jessica Ciencin Henriquez - previously joked that his new fiancée is "fully" on the side of Patrick Dempsey's character Andrew Hennings in their 2002 movie Sweet Home Alabama.

The movie sees Reese Witherspoon's Melanie Smooter leave her fiancé Andrew for Josh's alter ego Jake Perry at the end of the film.

He told Entertainment Tonight: "In [Brianna's] mind, she's like, 'But you're the guy that kind of ruined their relationship!'

"The funny thing is once she said that, all these people have come up to me and been like, 'Yeah, I was Team Patrick too.'"