News Jack Osbourne & Fiancee Welcome Baby Girl By Krista Wick 5:48 PM PDT, April 24, 2012 Photo: Twitter Sharon and Ozzy Osbourne are officially grandparents to a bouncing baby girl! Jack Osbourne Gets Engaged The happy news was announced early this afternoon by HELLO! magazine, confirming that Jack Osbourne and his fiancée Lisa Stelly had welcomed Pearl, an 8lb, 6 oz baby girl, to their family. Sister Kelly relayed her congrats via Twitter, adding that she is "one proud Auntie!" in her excitement for her brother's brand new bundle of joy. Jack Osbourne Reveals Baby News To Piers Morgan Last October, Jack revealed that he and his fiancée were expecting their first child, making Ozzy and Sharon Osbourne first-time grandparents.