The rapper Riff Raff – better known as the guy who showed up to the VMAs with Katy Perry in a hideous denim parody of Britney Spears – has lashed out in a very random way.

British singing sensation Sam Smith took a photo with the denim couple on the night, and shared the snap on his Instagram.

He tweeted the Instagram pic, writing:

“So amazing to see my girl @charli_xcx last night!! Smashing it so hard #STORTFORD”

The photo shows Sam posing with Katy Perry and Charli XCX… and the knee of Riff Raff who has been cropped out of the photo.

Mr Raff to say the least did not take this discovery well. He replied to Sam’s tweet with a torrent of abuse, writing:

"THANKS FOR CUTTiNG ME OUT OF THE PiCTURE U CHUBBY LiTTLE F*CK FACTORY"

"P.S. YOUR FACE iS SUPER HUGE"

Wow.

Sam and his “super huge” face haven’t responded to the tweet, probably because it’s insane.

It will be interesting to see if the rapper tried to escalate this crazy one-sided feud any further. We wonder what Katy has to say about this.