Jack Osbourne to be a father for the third time

Jack Osbourne and his wife Lisa are expecting their third child.

Ozzy and Sharon Osbourne's son is already a father to daughters Pearl, five, and Andy, two, and now Jack and Lisa are set to expand their family once again.

Lisa took to Instagram on Monday (28Aug17) to share a photo of the couple all dressed up, with her growing baby belly clearly on display in a figure-hugging floral gown.

In the image, the mother-to-be holds up her left hand in the shape of the devil horns rock gesture, with her thumb also sticking out, a nod to the unborn child being baby number three.

"Literally ate the biggest burrito ever," she joked in the accompanying caption.

The couple wed in 2012, shortly after Jack, now 31, was diagnosed with multiple sclerosis.

He and Lisa were also dealt a blow in 2013, when Lisa suffered a miscarriage while pregnant with a baby boy they had planned to name Theo.

She paid a special tribute to the child they lost in October, 2015, when she opened up about the tragedy to mark America's Pregnancy and Infant Loss Day.

"Today is national #pregnancyandinfantloss day," she posted on Instagram, alongside a card featuring two baby's footprints painted in blue. "I don't talk about what happened to us much, and I've never posted this photo before out of fear that someone would say something mean or negative. I don't care anymore.

"I would have an almost 2 year old son now, named Theo. I never got to meet him, and this is all I have to remember him by... his tiny little footprints. It still hurts every day, and I will always love & miss him. He was a real baby, and he was mine.

"My heart goes out to my friends, family, and those of you I don't know that have suffered the loss of a baby. I love you all!"