Rob Kardashian wants Blac Chyna to have four more children.

The 28-year-old model is expecting her first child with the 29-year-old reality star but they are already planning on expanding their family with a possible four more children.

Speaking on a Facebook live video on Wednesday (17.08.16), the model - who is already a mother to three-year-old King Cairo - said: ''Rob wants me to have like four more, or something like that. Three more, so four total. Plus King, that's five.''

The 'Keeping Up With The Kardashians' star backed up his request by praising his mother Kris Jenner for having five children and still looking amazing.

He said: ''That's what my mom did. She did five and she pushed them all out. Look at my mom! My mom is banging!''

Blac - who has King Cairo with rapper Tyga - had to agree, adding: ''Your mom looks bomb, though.''

The engaged couple are set to get their own reality TV show called 'Rob and Chyna' that will premiere shortly and it might well star an army of mini Kardashians in a few seasons time at this rate.

The news of the expanding family comes after the trailer for their TV show saw Chyna shouting down the phone to Rob in a heated argument before throwing a bunch of flowers into a pool, saying: ''Are you still texting b****es, yes or no?''