Ozzy Osbourne is going to be a grandfather again. The legendary Black Sabbath singer's son, Jack Osbourne, 25, announced Tuesday (Oct. 11) during an appearance on CNN's 'Piers Morgan Tonight' that he and his new fiance, actress Lisa Stelly, 26, are expecting their first child together.

"I'm excited. I'm a little nervous, but excited," Jack said during the TV show appearance alongside his parents. The news comes less than two weeks after confirming his engagement to Stelly.

The elder Osbournes, who appeared surprised as if they were hearing the news for the first time along with 'Piers Morgan' viewers, had different reactions: Sharon Osbourne started clapping and beamed proper like a proud mum, while Ozzy jumped up from his chair with arms outstretched and mumbled something unintelligible, then said, "I'm in shock. I think it's fabulous," before concluding, "it doesn't matter what I feel -- the baby's on its way."

Sharon will be a grandmother for the first time, while Ozzy reportedly has four grandchildren from his first marriage.

Stelly for her part must be exalted. Upon announcing news of her engagement, she tweeted last month, "The most amazing man I've ever met asked me to marry him ... and he wasn't joking! Crazy, right?"