It's baby girl for Rob K, Blac Chyna

On the premiere of their reality show 'Rob & Chyna,' the duo made a doctor's appointment to find out the sex of their baby, which revealed that revealed they are going to have a baby girl.

"I'm pretty nervous. I'm excited," Rob says before the big reveal. "I really want a boy," reports E!Online.

Withing a moment after, the doctor announced, "You are having.a girl!"

"Rob, it's a girl!" Chyna exclaims excitedly.

"Oh, that's crazy," Rob adds.

To this the doctor asked them, "You have a boy at home, right?" referring to Chyna's son with former partner Tyga, named King Cairo.

"Yeah, but I don't," Rob prompted. "That's OK, this is your first," the doctor said.

Moments before the doctor revealed the sex of their baby, Rob made a confession, "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 and I'm gonna be super happy with a girl."

"That's a nice, normal heartbeat. It's regular and there's no problems with the beat of the baby's heart,"" the doctor further tells Rob and Chyna.

The doctor continues the ultrasound and mocked a little, "Look it, she's putting her little booty right up at ya."

"She better not be doing that!" Rob jokes.