Kendall Jenner. Picture: Reuters

Kendall Jenner has grown "even closer" to her sister Kylie because of the arrival of baby Stormi.

The 'Keeping Up With The Kardashians' star was thrilled when she found out her younger sister was expecting a baby girl with her partner Travis Scott as says the arrival of Stormi six weeks ago has already made them "even closer".

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She said: "It's not that it's more exciting than any other births in the family - it's different exciting because she's my baby sister who I grew up with. We all grew up in twos: Kourtney and Kim grew up together; Rob and Khloé; Brandon and Brody; Burton and Casey, and then Kylie and I. So to see my best friend growing up have a baby? It's already made us even closer."

As for having children of her own, Kendall - who is thought to be dating basketball star Blake Griffin - wants to wait a few more years yet before starting a family.

Asked about the prospect of having kids, she told the new issue of Vogue magazine: "I am ready to wait. I want to have kids, but at, like, 28 or 29."

Meanwhile, Kendall previously opened up about what she looks for on a first date - "comfortability".

She said: "I also think like comfortability. I know a first date is already kind of awkward but I feel like once you're like, if you're on a first date with someone and you're like immediately kind of comfortable and you just feel like you're having a really nice time and you're laughing and enjoying each other and you kind of don't want to leave each other's side ...

"I think [for first kisses] the chemistry obviously. Like, you have to have the chemistry. You have to like them. It's not much if you don't really care. Like I'm not a pretender. Like I'm not gonna like be into someone and like not show it. If it's not there then I'm not gonna like try to push for something. I'm just like, 'OK, bye.'