United Kingdom, April 1 -- Kourtney Kardashian's son Reign has dismissed rumours suggesting Justin Bieber is his real dad.

'The Kardashians' star is mother to Mason, 15, Penelope, 12, and Reign, 10, with her ex-boyfriend Scott Disick as well as baby Rocky with husband Travis Barker, but Reign has long faced gossip about his parenthood due to his physical similarities to pop star Bieber - and now the youngster has shrugged off the speculation for good.

During an Instagram Live video with his step-sister Alabama Barker's boyfriend Scooter Jackson, Reign was asked about the rumours and he said: "No, he's [Bieber] not [my dad]. Bro, I swear, Justin Bieber is not my dad.

"Scotty ... Scotty ... Scotty is my dad. I don't know how old my mom w...