Kendall Jenner and Kylie Jenner only "occasionally argue."

Kendall Jenner and Kylie Jenner

Kendall Jenner and Kylie Jenner

The 20-year-old model, who got into a bitter war of words with her younger sister during the latest episode of 'Keeping Up with the Kardashians,' admits they "used to fight physically SO badly," but insists they're best friends.

In a new post on her official website and app, the brunette beauty wrote: "It's funny - growing up, Kylie and I were the terrible twosome! We were so rebellious and adventurous. We would run around all day long and just do stupid things with each other. I couldn't imagine growing up any other way. It was awesome having someone so close in age to me - we could relate to one another."

While she admits they are very different, Kendall says they are still very close.

She added: "Now, we'll occasionally argue with each other and say horrible things, but definitely not on the level that it used to be, lol. We've always remained close, but over the years the two of us have just matured. We've really kind of found our own identities, which I think was important to us both. For years we were really stuck as a duo and now we've truly become our own people [sic]."

Kendall branded Kylie, 18, the "biggest f**king b***h" and a "c**t" during last weekend's episode of their family's reality TV series after she refused to let her borrow a dress for the ESPY's.

In a clip for next week's show she also blasts Kylie for asking her boyfriend Tyga to tag along on their family holiday to St Barts.

Tagged in