Kanye West allegedly pummelled an 18-year-old man with over 30 blows.

On Monday (13.01.14), the rapper apparently assaulted a man who insulted his fiancée Kim Kardashian, calling her a ''n****r lover'' and a ''stupid sl*t'' on the streets of Beverly Hills.

It has now been claimed Kanye arrived on the scene minutes after the insults were made and stormed into a nearby chiropractor's office where the unnamed guy was, and then Kim identified the teenager.

According to TMZ, the 36-year-old hip hop star went ''nuts'' and made a beeline for the teen, beating him as Kim looked on.

Despite the receptionist shouting, ''Stop, stop'', Kanye allegedly kept hitting the guy until he curled up into a ball to protect himself.

The incident reportedly only ended when a massage therapist pulled Kanye away from the scene.

A police spokesperson confirmed earlier this week that the 'Stronger' star is now a suspect in a battery investigation and is wanted for interview. The incident may also be referred to the Los Angeles County District Attorney for prosecution.

Kanye - who has six-month-old daughter North with Kim - is already in trouble for allegedly assaulting a photographer at a Los Angeles airport in July last year. He pleaded not guilty, but the case has not been resolved yet.