Khloe Kardashian has slammed reports suggesting that cocaine was taken at her sister Kylie Jenner's graduation party.

The false rumours of alleged drug use at the event surfaced after a video emerged of a man appearing to rub a substance in his mouth.

Khloe is seen in the clip, twerking for the camera in a leopard-print dress, as the male guest wearing a blue jacket, laughs before putting his finger in his mouth.

The video was taken at the 17-year-old Kylie's high-school graduation on Thursday (23 July) and posted to Snapchat.

In a strongly worded message, the reality star took to Twitter on Saturday (25 July) to deny anyone was taking drugs.

The 31-year-old tweeted: "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 cameras.

"We aren't as wild as you want to believe. We were taking Jell-O shots though and you have to scrap [sic] 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," she added.

According to Mirror Celeb an insider said: "All guests over 21 were asked if they wanted a Jell-O shot. There were dozens of cameras at this afternoon party so to suggest anything thing else is outrageous."

Members of the Kardashian family posted images from the celebration on social media.

The party was on the same day that Caitlyn Jenner celebrated her renaming ceremony in the presence of friends and supporters including Culture Club singer Boy George.