Jack Osbourne and his wife Lisa Stelly have sadly disclosed they have lost their unborn baby.

"I have been dreading this announcement," Stelly wrote on her Raddestmom.com blog Thursday.

"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. 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."

Stelly, 27, revealed on her blog in early August she and Osbourne, the 27-year-old former The Osbournes star and upcoming Dancing with the Stars' seventeenth-season contestant, were expecting their second child.

They are currently parents to a one-year-old daughter named Pearl, who was born in April 2012.

"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!" Stelly said at the time.

Stelly and Osbourne, who also previously appeared on Armed & Famous, wed in Hawaii in October 2012.