Kim Kardashian reveals cruel things sister Kourtney used to say that would leave her in tears

Kim Kardashian has spoken out about what sister Kourtney used to say to her which would reduce her to tears.

In a recent episode of The Kardashians which sees the family celebrate Kourtney's 44th birthday, Kim reflects on her and the Poosh creator's relationship in their school days.

And it's fair to say, they were pretty brutal to one another. Prepare yourself for some classic Kardashian drama:

Kourtney - who recently welcomed a baby boy with Blink-182 drummer Travis Barker - and Kim haven't always had the easiest of relationships.

The eldest two of the Kardashian sisters, the pair seem to get along with each other the least and the Dolce & Gabbana drama certainly did nothing to help ease the feud.

Basically, the drama entailed Kourtney accusing Kim of 'stealing' her Dolce wedding theme in Portofino and the drama all comes to a head in season four of the family's reality TV series.

Kourtney even admitted in an episode of The Kardashians she has 'a happy life and that happiness comes when' she gets 'the f**k away' from her family, but 'specifically' Kim. Ouch.

And it turns out their tense relationship dates all the way back to when they were both at school together.

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The season four episode which recently came out sees the Kardashians head to Bowlero bowling alley for Kourtney's birthday bash.

Kim gives her sister a card which Kourtney reads aloud: "I’m proud to call you my sister. Hopefully this makes up for all the other things I’ve called you."

But what insults is Kim talking about?

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Well, Kim explains the card was basically 'made for' her and Kourtney, Kourtney admitting they 'used to say the meanest things' to each other.

"I used to have no feelings. All I would say is, 'You're so f**king cellulite-y'," Kourtney says.

Kim adds: "Or like in high school she would say, 'Ew my sister has big saggy t**s, you would hate her!'

"And like guys at school that I would like at a party and I’d literally walk away crying and be like, 'Bye guys.'"

Kourtney quickly responds: "I'm sorry, for the past."

And Kim thankfully seems to accept the apology, placing a hand on her chest and whispering: "Thank you."

Well, it would seem like the pair's relationship drama is resolved for now, but as all siblings know, it probably won't be long until another issue erupts.