Justin Bieber and Conor McGregor -- "The Biebs" and "The Notorious" -- are just a couple of bros having a "proper" breakfast together ... shirtless, of course.
JB and the MMA star were hanging out in Bev Hills Friday, as McGregor continues to recover from his gnarly leg injury suffered at UFC 264 in his loss to Dustin Poirier.
It may seem surprising -- especially since Bieber used to be tight with Conor's nemesis, Floyd Mayweather -- but Justin and Conor have been getting pretty chummy of late.