During Sunday night's big premiere of Rob Kardashian and Blac Chyna's E! reality show, Rob & Chyna, the couple revealed they'd be having a girl.

Chyna seemed excited about the news, but Kardashian was visibly disappointed.

'I'm pretty nervous. I'm excited,' Rob said before the big reveal. 'I really want a boy.'

In spite of his initial disappointment, Kardashian said in a confessional segment that he was actually thrilled to be having a daughter.

'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,' he said. 'I'm just happy that the baby's healthy and I'm gonna be super happy with a girl.'

The rest of the Kardashian clan also seems to be super happy. Both Kris and Khloe have Instagrammed this bizarre slot-machine cartoon of Rob and Chyna and the announcement.

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'So excited to welcome another little princess to our family. Congratulations @robkardashian and @blacchyna!!! I love you both! 👼🏻👑👶🏻#itsagirl #robandchyna,' Khloe wrote. Kris happily proclaimed, 'IT'S A GIRL! So happy for Rob and Chyna! Can't wait to welcome this new little love bug to the world. #RobandChyna @robkardashian @blacchyna 💗👶🏻👑🎀 '

From: ELLE US