Kim Kardashian has revealed shopping for baby clothes for her sister Kourtney's unborn baby has made her want to start a family.

Kim Kardashian is desperate for a baby.

The US reality TV star - whose sister Kourtney is expecting her first child with partner Scott Disick - admits shopping for her unborn niece or nephew has made her broody.

She wrote on her blog: "I want a baby!!!! OK, so maybe not right now, but I can't wait to be an aunt!"

Kourtney has previously said she is not sure whether she wants to find out the sex of her child before the birth, but Kim is adamant she should.

She explained: "It's really fun, but we have to stay neutral when you're shopping for a baby and you don't know what the sex of the baby is. I found that really hard...

"I just wanted to shop for pink or blue, haha! I want Kourt and Scott to find out already (sic)!!"

Kourtney, 30, revealed she was pregnant last month, and was unsure how her 28-year-old sister would react as Kim always wanted to be the first one to have kids.

Kourtney said: "I don't think she's envious. Who knows though - Kim gets mad if I get the car that she wants... she like freaks out! But she definitely thought it was going to be her first, trust me!"