Diddy, 43, took to micro-blogging site Twitter to deny rumours, reported Ace Showbiz.
"I usually don't address rumors but I got too much respect for my brother J Cole. We are friends. The rumors are not true. We had a great party," he wrote.
Justin Timberlake, his NSYNC bandmates and his wife Jessica Biel were reportedly there along with the likes of Jamie Foxx, Pharrell Williams, Busta Rhymes, Kendrick Lamar, Drake, Rihanna and Leonardo DiCaprio.
