They announced that they were expecting their second child just last month.
But on Thursday Jack Osbourne's wife Lisa Stelly confirmed the sad news that she has suffered a miscarriage.
Clearly devastated by the tragic loss of their unborn son in her second trimester, the model took to her blog to make the confirmation.
She wrote on Raddestmom.com: ''I have been dreading this announcement…. I needed some time before being able to say it.
''Jack and I lost our baby boy last week. Having a late term miscarriage is by far the hardest thing either of us have ever had to go through.''
She added: ''We appreciate all of your prayers and ask for privacy and respect during this time. It’s important to stay hopeful and optimistic through life’s toughest moments.
''We never know why things like this happen. All we can do is trust in God and know he has a plan for our lives.''
The rock star offspring and his model wife already have a 16-month-old daughter, Pearl, who they are rarely spotted out and about without.
Clearly over-the-moon just a few weeks ago, the couple announced that they were expecting their second child by posting a picture of her positive pregnancy test on her blog.
She wrote: ''Jack and I are super excited to share you all that we are expecting out second baby! I am in my second trimester, feeling great & trying not to eat everything in sight.''
Adding: ''We feel so blessed that out family is growing & Pearl will have a little brother of sister to play with. It's crazy to think that we will soon be a family of four!''
Jack is currently gearing up for his appearance on Dancing With The Stars and was spotted leaving rehearsals on Thursday, putting on a brave face following his devastating news.