X17online published photographs of the pair appearing to get cosy at Los Angeles nightclub Supperclub, with supposed insiders claiming that the pair locked lips.
"They were dancing close for a while and being all touchy-feely and finally Chris leaned into her," a source had alleged
"She put her head on his shoulder and they started kissing! I couldn't believe Chris was being so obvious about it!"
However, the two musicians have shot down the claims and insisted that they are just good friends.
"There is absolutely no truth to the ridiculous story regarding Nicole and Chris Brown," Scherzinger's rep told RumorFix.
"The photos that have surfaced are of old friends who were trying to talk at a very loud club. I guarantee there will be no photos of them kissing. This is a non-story."
Brown's rep added: "No story here. They were not kissing. They are friends, and have been for years. They were talking at a club that was playing loud music."
Brown has been dating model Karrueche Tran since late 2011, while Scherzinger is in a long-term relationship with Formula One racer Lewis Hamilton.
She is currently a judge on The X Factor UK.