Jack Osbourne is to become a father again.

The 31-year-old reality TV star - whose parents are rocker Ozzy and Sharon Osbourne - and his wife Lisa Stelly have announced they are expecting their third child together.

The brunette beauty took to her Instagram account on Monday (28.08.17) night to share a photograph of her and Jack standing in front of the mirror with her blossoming baby bump clearly on display just before an apparent date night.

She teamed the sweet picture with the funny caption: ''Literally ate the biggest burrito ever (sic).''

The couple - who got married in 2012 - are yet to reveal any more details about the pregnancy, including the sex and due date, but their daughters Pearl, five, and Andy, two, are no doubt looking forward to meeting their little brother or sister.

Since becoming a father, Jack - who suffers with Multiple Sclerosis (MS) and is blind in one eye as a consequence - has realised babies are not as fragile as he first thought.

He said last year: ''Advice I would give to an expecting dad would be [that] babies are not as fragile as you assume.

''I remember the first couple weeks when Pearl was born, I was [like], 'I don't know, I'm gonna break it!' You can change them out of their clothes and you won't break them.You can hold them without crushing them. Babies are built to last.''

But the pair suffered a heartbreaking set back in 2013 when Lisa miscarried a baby boy and she needed time to come to terms with the loss before trying for another child.

She said at the time: ''Losing a baby really does do a lot of damage personally and to the whole family. I needed to take some time and come to terms with our loss. I'm really glad we did [wait]. When I got pregnant [with Andy two years later], I was fully prepared. It wasn't like a Band-Aid. I still have moments here and there, of course.''