Keeping Up With The Kardashians star Khloe hit out following speculation sparked by a Snapchat video that went viral.
One of the videos posted by sister Kylie shows 31-year-old Khloe twerking, with a man next to her allegedly appearing to snort a substance.
But Khloe slammed speculation after tweeting on Saturday (25 July): "You guys will make up anything. No! No one was doing coke at a graduation party in broad daylight 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 the rim of the shot glass w ur finger to loosen up the jello in order 2 take it," she added. "Just say no to drugs kids! Drugs so not our style."
The Kardashian clan took to social media to share photos from the celebration last week, which was hosted by Ryan Seacrest.
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All you need to know about Khloe Kardashian: