Expect Justin Bieber to be a no-show when Floyd Mayweather takes on Conor McGregor in Las Vegas.
Bieber unfollowed Mayweather on Instagram.
Mayweather has also reportedly told friends that he now considers the Biebs to be a "traitor."
Their drama could explain why Bieber told a TMZ videographer last week that he doesn't think Mayweather will beat McGregor.