Jack Osbourne, the son of legendary heavy metal singer Ozzy Osbourne and America's Got Talent judge Sharon Osbourne, became engaged to his girlfriend, Lisa Stelly, Thursday. Stelly borke the news via her Twitter account, writing, "The most amazing man I've ever met asked me to marry him… and he wasn't joking! Crazy, right :)." The couple has been together for four months.

Stelly, 24, is an aspiring actress whose credits include a Green Day video. Jack, 25, first rose to fame from his role on the MTV reality series The Osbournes, which debuted in 2002 and ran through 2005. The show followed Jack's family as they tried to live regular lives, not an easy task when the family patron is known as the Prince of Darkness. In many episodes, Jack and his sister Kelly came across as bratty, spoiled celebrity children.

In the years following the series, Jack reportedly struggled with an addiction to Oxycontin but has since gotten clean. He has also embarked on a career behind the camera as a producer and director with a level of success that suggests he has matured quite a bit since his teen years. His most recent work is a documentary about his father, titled God Bless Ozzy Osbourne, that debuted at the 2011 Tribeca Film Festival. The film follows the rise and struggles of his rocker dad and includes never before seen footage taken from interviews with Paul McCartney and Tommy Lee, among others, according to The Daily Mail.

No word yet on when the wedding will take place, but Jack has the support of his sister, who tweeted her congratulations. Kelly, who is just a year older than Jack, wrote that she was proud of the man he has become.

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