Jack Osbourne is engaged to be married. 

The 25-year-old reality TV star turned film director proposed to his girlfriend of four months, Lisa Stelly, and she said yes. The model and actress revealed the news to her followers on Twitter earlier today, September 30, and wrote:

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

Osbourne hasn't yet spoken out about the exciting development in his relationship, but you can watch him talk about his latest project as the director of 'God Bless Ozzy Osbourne' below: