Jack Osbourne – who is of course the son of rock legend Ozzy Osbourne and TV celeb Sharon – has announced that he and his fiancé Lisa Stelly are expecting a baby.

The couple have only been together for four months, but it seems Jack couldn’t be happier at the news that he’s to be a dad.

Jack made the announcement that Lisa is four months pregnant while appearing on Piers Morgan’s chat show in the US.

He said, “I’m excited. I’m a little nervous.”

Jack and Lisa became engaged two weeks ago, and at the time, Lisa tweeted, “The most amazing man I’ve ever met asked me to marry him — and he wasn’t joking! Crazy right?”