Blac Chyna already knows the sex of her baby.

Rob Kardashian and Blac Chyna

Rob Kardashian and Blac Chyna

The 27-year-old model and her fiancé Rob Kardashian only announced their pregnancy news on Friday night (06.05.16) but it seems the blonde beauty is further gone than initially thought as she already knows what she's carrying.

A source explained to E! News: "They do know the sex of the baby and will reveal it soon enough."

The unborn tot is the second child of Blac's as she also has three-year-old son King Cairo with her ex-fiancé Tyga, who is now dating Rob's half-sister Kylie Jenner, while the soon-to-be new addition is the first for the sock designer, 29.

And, although the news came as a shock to most, it seems the loved-up couple were trying to fall pregnant.

The insider added: "They are so happy about the news. Chyna wanted another baby and said if it happens, it happens. She's not done with having babies."

However, the entrepreneur - whose real name is Angela Renée White - has been having a tough time with her pregnancy so far as she's battling with morning sickness.

The source said: "Chyna had a bit of morning sickness and felt pretty tired but is doing OK. Rob and Chyna will be getting one of the rooms in his house all ready for the baby. Chyna told [son] King about his new sibling on the way."

Meanwhile, the couple's happy news comes just a month after they announced they were engaged following a whirlwind four-month relationship.

Despite it still being early days of their romance, the pair have had a tough time of late as Rob's famous family were reportedly furious when they heard he was dating the model.

But, although it's still a touchy subject for the showbiz clan, it seems they have now buried the hatchet for Rob's sake.