The Fashion Police co-host revealed that she often cries when thinking how far Jack has come in his life, saying that his engagement to girlfriend Lisa Stelly and the fact that the couple are expecting their first child often make her cry.
"He makes fun of me because every time I'm around him I get teary eyed now," Kelly told E! News.
"He's like, 'Stop it! Go away. Stop being dramatic. Get out of my face.' 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 fiancée ever!'"
Kelly also insisted that their father Ozzy Osbourne would not be performing at Jack's upcoming wedding, adding: "I don't really think rock music is quite appropriate for a wedding."
Kelly and Jack's mother Sharon Osbourne has promised to be "the grandmother from hell" by spoiling Jack's future son or daughter.
> Sharon, Ozzy Osbourne 'enjoy rampant sex life'