Rob Kardashian and Blac Chyna are expecting a baby girl.

Rob Kardashian and Blac Chyna

Rob Kardashian and Blac Chyna

The 29-year-old reality television star announced the gender of his and the 28-year-old star's first child on their new TV show 'Rob & Chyna', and his family were quick to share their excitement on Twitter.

Rob's mother Kris Jenner, 60, tweeted: "IT'S A GIRL! So happy for Rob and Chyna! Can't wait to welcome this new little love bug to the world. #RobandChyna. (sic)"

Kim Kardashian West, Rob's sister, added: "Congrats @robkardashian & @BLACCHYNA on your baby girl!!!!!! (sic)"

The news comes soon after Chyna's father Eric Holland claimed the couple were expecting a baby boy.

He said at the time: "Rob and I have had some one-on-one time. All I can say is he's excited about the prospect of a boy.

"For Angie (Blac Chyna), the most important thing is that the baby is healthy. They were really excited when it kicked for the first time. They've chosen a name but they've not told anyone what it is. They want to wait until the baby is born."

The 'Keeping Up With The Kardashians' star - who originally said he wanted a boy - isn't downhearted by the prospect of a girl.

He said: "It's an emotional moment. Me wanting to have a boy, it definitely stems from my dad but I'm sure I'll have the same relationship that I had with my father with my daughter. I'm just happy that the baby's healthy."