"After four years together, I'm just so happy to be ENGAGED to the love of my life @ElyciaMarie!!!" the former Malcolm in the Middle star, 25, Tweeted.
"It's official... I'm engaged!" Turnbow also Tweeted Saturday.
Earlier this year, police were called to their home in Phoenix in February to investigate an incident in which, allegedly Muniz punched and pulled a gun on Turnbow.
There was even a 911 call placed during the domestic melee.
"Neither one is interested in finger-pointing at the other," Muniz's rep said at the time. "It was a situation that escalated beyond a point that it needed to be ... If anything, they will look back at this as a learning opportunity."
Apparently a good one. Congrats to the engaged pair!