Ozzy Osbourne has become a grandfather for the fifth time.

On Tuesday, Ozzy’s son Jack and his fiancée, actress Lisa Stelly, welcomed a daughter named PEARL at a healthy 8 lbs., 6 oz.

The couple were engaged last September.

Ozzy already has four grandchildren; two each from daughter Jessica and son Louis from his previous marriage to Thelma Riley.

Proud sister – and Aunt - Kelly Osbourne tweeted, "thank you so much for your congratulations but they realy should be gonig to @lisamarstelly & @mrjacko! I am one proud Auntie!"

Sharon Osbourne joined in as well, adding, "Today I witnessed my first grandchild being born, life changing experience. She is an angel."