Gary already has a six-year-old daughter, Leah, with fellow Teen Mom star Amber Portwood and is looking forward to having another little girl in his life.
Taking to Twitter, Gary recently shared a scan picture of his unborn child, saying: "There she is!!!!" He has since added: "Wondering what my new girl is gonna look like:)))))))."
Gary and Amber welcomed Leah into the world in front of the cameras, after signing up to MTV show 16 & Pregnant while at high school.
The couple went on to star in spin-off series Teen Mom and viewers saw their volitile relationship crumble as Amber's behaviour spiralled out of control.
Gary looked after Leah when Amber began a five-year jail sentence in 2012, instead of going to rehab, and she was released after 17 months. The couple now share custody of their daughter.
Last year, it was revealed that Amber and Gary will be returning for a new series of Teen Mom, which will also feature original stars Maci Bookout, Catelynn Lowell and Tyler Baltierra and Farrah Abraham.
Since we last saw them, Catelynn and Tyler have had another baby, while Maci is also pregnant with her second child.
The new series is set to air in the US in March, but there has been no transmission date as of yet for the UK. We have been pestering MTV though, so will let you know as soon as we hear!
Celebrities expecting babies in 2015:
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