Kylie Jenner doesn't think she'd be ''friends'' with Kendall Jenner if they weren't sisters.

The 'Keeping Up With The Kardashians' star may be close to her older sibling but she isn't convinced it would be the same if they weren't related.

Speaking in a preview for her reality show 'Life of Kylie', the television personality said: ''Kendall and I, I don't think we'd be friends if we weren't sisters.''

Meanwhile, Kendall previously admitted she hates being told she is ''jealous'' of her sister.

She shared: ''I hate drama so much! I've truly never been a dramatic person, not even when I was younger. The only time I would cry is if I wasn't allowed to ride my horses.

''In terms of jealousy, I've never been that type (not even with Kylie, haha)! When people are acting jealous towards me, I just write them off and move on. Staying out of drama is just pretty simple for me! (sic)''

The sisters are so close that they even share their ''old underwear''.

Kylie said: ''I let her borrow whatever she wants. She always comes through and is like, 'I need an outfit please,' and I'll let her borrow whatever.

''And then I go over there, and I'm like, 'Kendall, I need a pair of sweats to go home,' and she'll give me the most uncomfortable old underwear, the worst sweats you've ever seen and anything that's so bad and old and small. And I'm like, 'You're so mean.'''