Reports have recently starting circulating that the Kardash bro is dating reality star, Mehgan James.
An insider told US Weekly that the relationship "is fairly new" and the pair are trying to keep a low-profile.
Now, Rob has taken to Twitter to slam the rumours, claiming that they are untrue.
"Wait reading online about some chick I'm dating Megan something," the shocked star wrote.
"Not true never even met her or heard of her before."
Fans saw right through Rob's tweet and were quick to slam him via Twitter.