Jack Osbourne, 25, the son of musicians Ozzy and Sharon Osbourne, announced Tuesday that his fiancée, actress Lisa Stelly,  is expecting their first child together.

A reality television actor and director, Osbourne announced the big news during an interview with CNN's Piers Morgan on Tuesday, according to a report in People magazine.

I guess I do have something to tell you, I am about to be a father. I'm excited. I'm a little nervous, he admitted in the interview.

Osbourne proposed to Stelly in September and it appears that less than a month into their engagement, they are all set to start a family of their own.

The mom-to-be tweeted after her engagement, saying: “the most amazing man I’ve ever met asked me to marry him….and he wasn’t joking!”

The Osbournes are equally excited at the thought of becoming grandparents and welcoming a new member to the family.

I'm shocked. I think it's fabulous, said Jack’s father, Ozzy .

I'm happy because it's what Jack wants, so I'm happy, and I've always wanted to be a grandma so it couldn't be better, said Sharon Osbourne, Jack's mother, who will become a first-time grandmother.

Jack's sister, Kelly Osbourne, later tweeed, “I'm the happiest girl in the world I'm going to be an auntie!”