Shia LaBeouf Talks Married Life, Freestyle Raps on 'Sway in the Morning' -- Watch!

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Shia LaBeouf is a monogamous guy.

The Transformers star opened up about his recent Las Vegas wedding to Mia Goth (although the two may not be legally married), on Friday's Sway in the MorningSirius XM radio show, calling it one of the best decisions he's ever made!

WATCH: Shia LaBeouf and Mia Goth Aren't Legally Married After Elvis-Themed Vegas Ceremony

"I love it, man. That's one that's not been a f**k up, that's been the best thing I ever did for myself," the 30-year-old actor shared. "I'm like a serial monogamist. I think it's cause I'm deeply insecure. Once you get vulnerable with a person, that's it. I've never been a one night stand guy." "

"I think was after something real substantial this time, I'm 30 years old," LaBeouf said of why now was the time to hold a ceremony. "And you know when you know."

WATCH: Shia LaBeouf and Mia Goth Live Streamed Las Vegas Wedding Officiated by Elvis Impersonator

During the interview, LaBeouf also expressed regret for criticism he had of Steven Spielberg -- whom LaBeouf has worked with on multiple projects including Disturbia, Transformers, Eagle Eye, and Indiana Jones and the Kingdom of the Crystal Skull -- when he said to Variety that the director "is in a different stage in his career. He's less a director than he is a f**king company."

"I f**k up sometimes. I probably could have gone lighter on Spielberg, that's something I should have backed off of," the actor admitted to Sway in the Morning host, Sway Calloway. "But my feelings are real. Dude gave me a lot of opportunities though. And that's on me."

WATCH: Shia LaBeouf Slams Steven Spielberg, Talks Almost Nabbing 'Suicide Squad' Role & Getting Two Missy Elliott Tattoos

After the talking was done, LaBeouf tried his hand at freestyle rapping for the program's "Five Fingers of Death" segment, where he shocked Sway with his surprisingly good rhyming abilities!

Check it out below.

MORE: Shia LaBeouf Is Hitchhiking Across the Country and Calling It Art

Meanwhile, LaBeouf was decidedly less forthcoming about his recent nuptials while talking to James Corden on the Late Late Show, though the actor did tell the hilarious story of how he met the late night comedian.

Watch the video below.

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