01/24/2012 10:44 am ET

Ozzy Osbourne Won't Be Singing At Son Jack's Wedding

Just because your dad is a famous musician, it doesn't necessarily mean you want him to play at your wedding -- especially if your dad Ozzy Osbourne.

Kelly Osbourne told E! News not to expect the Black Sabbath rocker to sing at her brother Jack's upcoming wedding. "I don't think rock music is quite appropriate for a wedding," she said.

Jack and fiancee Lisa Stelly announced their engagement in September and two weeks later shared the good news they were expecting a baby.

Both Jack's parents were thrilled and mom Sharon told Piers Morgan, "I'm happy because it's what Jack wants, and so I'm happy because I've always wanted to be a grandma," Sharon said, with Ozzy chiming in that he's also excited for their son. "I think it's fabulous," the rocker said, grinning from ear to ear.

With Stelly getting closer to her due date, Kelly confessed to E! News that Jack isn't the only only who is getting emotional about the upcoming wedding and baby Osborne on the way.

"He makes fun of me because every time I'm around him I get teary eyed now," Kelly said, "Because I'm like, 'I'm so proud of you. you're moving into a new house. You're getting married. You're having a baby. You have the most amazing fiancee ever!"

More celebs expecting new additions to their families:

2012 Babies(CLONED)