There is no information available in my previous data regarding Justin Bieber filing for full custody of Reign Disick, Kourtney Kardashian’s son. The headline you’ve provided seems to be a hypothetical or fictional scenario, as Bieber and Kardashian have not been reported to have any direct connection regarding Reign’s custody.

Kourtney Kardashian’s son, Reign Disick, is the child she shares with her former partner, Scott Disick. Any custody arrangements regarding Reign would typically involve Kardashian and Disick, as they are his biological parents.

If there were ever a situation where someone unrelated to Reign, such as Justin Bieber, attempted to file for full custody, it would be highly unusual and likely met with legal challenges. Custody cases typically involve the child’s biological parents or legal guardians, and any third-party intervention would require substantial evidence to support such a claim.

Given the complexity and sensitivity of custody cases, it is important to approach such matters with caution and rely on verified information from credible sources. Let me know if there’s anything else I can do for you.