Khloe Kardashian has taken to Twitter to pour cold water on speculation that a guest was taking cocaine at Kylie Jenner's graduation party.

Eagle-eyed celeb watchers had spotted that a man in the background of a video from the event appeared to be rubbing a substance into his mouth.

Expressing her exasperation with the rumours, she wrote: "No one was doing coke at a graduation party in broad day light with teenagers and 15 production cameras!

"We aren't as wild as you want to believe. We were taking Jell-O shots though and you have to scrape the rim of the shot glass w ur finger to loosen up the jello in order 2 take it. Just say no to drugs kids! Drugs so not our style."

You guys will make up anything. No! No one was doing coke at a graduation party in broad day light with teenagers and 15 production

— Khloé (@khloekardashian) July 25, 2015

cameras! We aren't as wild as you want to believe. We were taking Jell-O shots though and you have

— Khloé (@khloekardashian) July 25, 2015

And a rep for the reality TV clan repeated this claim to The Mirror.

"All guests over 21 were asked if they wanted a Jell-O shot," the spokesperson explained.

"There were dozens of cameras at this afternoon party so to suggest anything else is outrageous."

So there you go.