Reality star denies using drug again

Rob Kardashian tells family to chill, "I'm not on drugs".

The 28-year-old star insists he's sober as a mule and wants the Kardashian-Jenner clan to back off!

Sources close to the family tell TMZ, Rob is pissed that his family believes he has slipped back into drug use. Instead he says living with new girlfriend,  Blac Chyna has improved his quality of life.

READ MORE: Rob Kardashian demands new reality TV show with Blac Chyna

The controversial star, who' recently diagnosed with Type Two Diabetes, says he's finally eating to lose weight and works our everyday because Chyna has a gym in her house [California].

READ MORE: Blac Chyna's mother attacks Khloe Kardashian for mocking star's arrest

Well, we won’t blame Rob's family especially after Chyna was arrested at the Austin International Airport on Friday, January 29 when police found ecstasy pills in her sunglasses case.