Jack Osbourne and Wife Lisa Expecting Baby No. 2

Jack Osbourne and his wife Lisa are expecting their second child, the couple announced Tuesday on Lisa's blog.

"We feel so blessed that our family is growing and Pearly will have a little brother or sister to play with. It's crazy to think that we will soon be a family of four," she wrote.

Jack Osbourne has multiple sclerosis

The 27-year-old son of Sharon and Ozzy Osbourne and his wife are already parents to 15-month-old Pearl Clementine. The couple married in Hawaii last October.

His sister, Kelly Osbourne, recently announced that she is engaged to marry her boyfriend Matthew Mosshart.