Jack Osbourne is engaged

(CBS) Jack Osbourne has proposed to his girlfriend, actress Lisa Stelley.

Stelley  shared the engagement news on Twitter: "The most amazing man I've ever met asked me to marry him....and he wasn't joking! Crazy, right? :)."

Pictures: Celebrity weddings and engagements
Pictures: The Osbournes

Osbourne's rep also confirmed the news to People magazine.

Osbourne, 25, and Stelley, 26, have been dating for four months, according to the Daily Mail.

The son of rocker Ozzy Osbourne and "The Talk" co-host Sharon Osbourne, Jack appeared with his parents and sister Kelly on the MTV reality show "The Osbournes." Most recently, he produced a documentary about his dad, "God Bless Ozzy."