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Watch Rob Kardashian and Blac Chyna Learn the Sex of Their Baby

Rob didn't see this one coming!

Sadie Gennis

It's a girl for Rob Kardashian and Blac Chyna!

During Sunday's series premiere of Rob & Chyna, the sock designer and former stripper went to their doctor to discover the sex of their first child together. And though Rob admitted "I really want a boy," he later appeared thrilled to be having a daughter when he told his mother Kris Jenner the news.

Despite the Kardashian family's rocky relationship with Rob's fiancé - who has a son with Tyga, Kylie Jenner's boyfriend - the famous family was quick to congratulate the couple on social media after the big reveal.

Rob & Chyna airs Sunday at 9/8c on E!