Jack Osbourne is going to be a dad.

The 25-year-old child of rock royalty and his fiancee, Lisa Stelly, are expecting their first child. He made the announcement on “Piers Morgan Live” with his parents, Ozzy and Sharon.

“I’m excited. I’m a little nervous,” Osbourne said before adding, “I’m not going to do a reality show.”

The couple announced their engagement in late September.

“I'm happy because it’s what Jack wants,” Sharon told Morgan. “I've always wanted to be a grandma.” Ozzy, who jumped out his chair with excitement and called the news “fabulous,” is already a grandfather. His son and daughter from a previous marriage have children.

Kelly Osbourne, Jack’s older sister, celebrated the announcement on Twitter: “been waiting 2 say this for so long im the happiest girl in the world im going to be an auntie! @lisamarstelly welcome 2 the family i <3 u.”

Jack Osbourne simply tweeted a smiley face.