Kourtney Kardashian's son wants to call his unborn baby sister Rosie.

The reality TV star is expecting a little girl with partner Scott Disick and their two-year-old boy, Mason, already has ideas for the tot's moniker.

Kourtney's sister, Kim, said: "I don't think she goes for the K thing. I said, 'Are you going to start the M thing?' And I don't think so either. Mason wants to name her Rosie because his favourite cartoon character, I forget the guy's name, but he always tells me his sister is named Rosie so he thinks that any sister is a Rosie."

Kim says Kourtney is enjoying her second pregnancy although is struggling a bit because she's bigger than when she was expecting Mason.

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She told E! Online: "She's doing so good. She's really calm. She's a little bit bigger this time than she was last pregnancy at this time so she's a little bit uncomfortable already at that phase. She's doing good but I feel so bad for her because she's getting so big a lot quicker."

- BANG! Showbiz