One of the stars of a US reality TV show has been filmed grabbing out a handgun in front of her son during a serious case of road rage.

The latest episode of MTV’s Teen Mom 2 sees Jannelle Evans become involved in an altercation with another motorist while her eight-year-old son is riding shotgun.

The motorist nearly causes an accident after tailgating Evans before pulling in front of her, causing the reality TV star to jam on the brakes.

Furious at the motorist’s driving, Evans reports them to police before deciding to follow them home, where she is then caught on camera pulling out a gun in front of her son.

When the driver finally arrives home, Evans is then filmed reversing over their mailbox, before the driver reacts by hitting her car with their vehicle.

Its’s at this point when Evans grabs for the gun once more and turns it on the motorist. However, the MTV show masks this part of the altercation with a black screen and the caption “At this point, Jannelle pulled out her firearm”.

Watch the madness unfold below: