Jack Osbourne becomes a dad Jack Osbourne arrive for the Tribeca Film Festival Premiere of "God Bless Ozzy Osbourne" at the BMCC Tribeca PAC in New York on April 24, 2011. LOS ANGELES, April 24 (UPI) -- Actress Lisa Stelly, the fiancee of British reality TV personality Jack Osbourne, has given birth to their first child, a daughter, Hello! reported Tuesday. Hello! can exclusively announce the safe arrival of @MrJackO & @lisamarstelly 's baby girl Pearl weighing 8lb 6oz. Love & congrats to them!" the magazine said in a Twitter posting. Where and when the baby was born were not reported. Osbourne is the 26-year-old son of rocker Ozzy Osbourne and "The Talk" co-host Sharon Osbourne. Osbourne and Stelly, 26, confirmed their engagement last year.