Kourtney Kardashian's son speaks out on longstanding conspiracy theory that Justin Bieber is actually his father

Reign Disick wants you to know who his real dad is.

The 10-year-old is the youngest son of Scott Disick and Kourtney Kardashian, who famously dated on-and-off between 2006 to 2015 and also share Mason, 15, and 12-year-old daughter Penelope.

This all came before the Keeping Up With The Kardashians star went on to welcome baby boy Rocky with husband and Blink 182 drummer Travis Barker in 2023.

Reign was born just a year before his parents' break-up, and Kourtney was rumored to be dating Justin Bieber at the the time (who is 15 years her junior).

They pair never confirmed their romance, but Justin once described the reality TV star as 'great'.

"I’ve known [the family] for years," he added during his appearance on The Bert Show in 2016.

With their reported romance and the timeline of Reign's birth in mind, there have been conspiracy theories that the 10-year-old is actually Justin's and not Scott's.

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Some have argued that Reign bare some resemblance to the 'Peaches' hitmaker, but the young boy knows who is real family is.

Speaking in a Instagram Live video alongside his stepsister Alabama Baker's new boyfriend Scooter Jackson, Reign said: "Bro, I swear. Justin Bieber’s not my dad. Scotty is my dad."

"I think Justin Bieber was 16 when I got born," the youngster went on to quip. "Yeah, I don’t think my mom would do that."

Kourtney herself is yet to comment on the theories about who Reign's supposed real dad is. In fact, she rarely comments on this type of speculation, but went against the grain in early March amid reports that her eldest son Mason had fathered a child.

Taking to her Instagram Story, the mom-of-four wrote: "I rarely address rumors or conspiracies regarding myself or my family, but this is about my child and it feels wrong to let anyone think for a second that these lies are remotely true.

"They are not. Mason does not have a child.

"My son really values his privacy, and I am asking all media to please be respectful: his is a kid with feelings and a beautiful life ahead of him. Please stop spreading false narratives and spinning lies.

"And to all the other people making videos about my kids (who, by the way, are minors), please stop and leave them alone."