Sharon Osbourne says that she is going to be uncontrollable when she becomes a grandmother later this year.

The 59-year-old's son Jack is expecting his first child with fiance Lisa Stelly in April and The Talk host is counting down the days for when the baby arrives.

But she admits that she may annoy her son and future daughter-in-law with what she has planned for the bundle of joy.

"I am going to be the grandmother from hell," she told People magazine. "I am going to spoil this baby so bad. My son and Lisa are going to be like, Get out of here!'"

But Sharon has revealed that she will not be buying anything for the tot until he or she makes their grand debut.

"I'm very superstitious," she said on why she will wait on making any purchases.

It will be the first grandchild for Sharon and her husband, rocker Ozzy Osbourne.