One major reminder that the 27-year-old is all grown up? He and his wife, Lisa Stelly, have announced that they're expecting their second baby. They welcomed their daughter, Pearl Clementine, in April 2012.
"Jack and I are super excited to share with you all that we are expecting our second baby!" Stelly wrote on the RaddestMom website. "I am in my second trimester, feeling great & trying not to eat everything in sight. We feel so blessed that our family is growing & Pearl will have a little brother or sister to play with. It's crazy to think that we will soon be a family of four!"
Osbourne and Stelly, who tied the knot in October 2012, haven't wasted any time in starting a family. Their kids will be born less than two years apart, which means their age difference will be slightly bigger than the 13-month gap between Jack and Kelly. (Older sister Aimee, who did not want to be featured on "The Osbournes," is just 13 months older than Kelly.)
Jack has raved about being a dad in the past. When he appeared on his mom Sharon Osbourne's show, "The Talk," in July 2012, he explained that becoming a parent even helped him to better cope with the multiple sclerosis diagnosis that he went public with last year.
"When you get news like MS, it's a bit of a buzzkill," he said. "But having a baby is forcing me to focus on just that and my work, so it takes the sting away a little bit."
Congrats to the happy family!
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