Professor Green has launched a foul-mouthed Twitter tirade at Made in Chelsea's Spencer Matthews after he labelled the rapper's fiancée Millie Mackintosh a 'show pony'.

The Read All About It rapper, whose real name is Stephen Manderson, was left unimpressed after Matthews slated his woman in an interview with Star magazine.

Green, who got engaged to Mackintosh in March, hit back at her reality co-star in a string of expletive-filled messages on Twitter and described Matthews as an attention seeker.

"You're vile, don't utter a f***ing word about our engagement - it's none of your f***ing business," he wrote. "Not into some silly pompous jumped-up **** yapping off at the mouth for some exposure.

He continued: "What kind of 'man' opens their mouth and talks about something when they have your number but they don't talk to you?

"Someone begging for attention, that's who. Well there you have it, attention. Enjoy. @SpencerGeorgeM."

Earlier this month, Matthews used his magazine interview to mock the couple's relationship in a series of bizarre comments.

"Millie is with Professor Green, who isn't on the show, so what is being covered?" he said.

"She is just getting involved in everyone else's business... it's just like, 'No one really gives a f*** what you think'. Millie is the show pony; I have nothing nice to say about her."

Looks like someone won't be getting an invite to the wedding...