Floyd Mayweather has dubbed Justin Bieber a "traitor" after the Biebs hit him with the "unfollow" button on Instagram. 

According to TMZ, Mayweather went "insane, nuclear" after being unfollowed because he had supporter Bieber during his rough times while everyone else was attacking him and calling him out. 

TMZ reports that the Hillsong Church has advised Bieber to reevaluate his friends and to distance himself from those who are bad influences, and it appears Floyd fell into that category.  

Per TMZ,

"Our sources say Justin didn't want a clean break from Floyd, he just wanted to "reset boundaries" ... walling himself off from things like Floyd's obsession with strip clubs."

"Justin unfollowed Floyd on Instagram as part of the resetting of boundaries, and our sources say Floyd went "insane, nuclear." He lashed out at Justin, called him a "traitor" because Floyd had stuck with Justin during his meltdown when everyone was attacking Bieber."

In other words, don't expect to see Justin Bieber in the building, let alone escorting Floyd Mayweather to the ring, this Saturday, August 26th when Floyd takes on Conor McGregor.

Even without Bieber, there will be plenty of star power at the T-Mobile arena in Las Vegas this weekend. TMZ obtained a partial celebrity guest list which includes Drake, LeBron James, Denzel Washington, Diddy, Elon Musk, Angelina Jolie, Jamie Foxx, Mark Wahlberg, Rick Ross and New England Patriots owner Robert Kraft, just to name a few.

The fight itself has the potential to be the most valuable money fight of all-time, eclipsing Mayweather's and Manny Pacquiao's May 2015 fight which brought in a record $623.5 million. Between ticket sales, ppv buys, sponsorship sales, merchandise sales and betting, it is expected that Mayweather vs. McGregor will certainly be int he $625 million ballpark.

While McGregor opened up as a huge underdog, with odds like +1100 at some Vegas sportsbooks, the trends have shifted over recent weeks and he is currently listed at +450.

The two fighters will come face to face one last time before their match this Friday for the pre-fight weigh-in. The event will kick off at 1pm EST, though Mayweather and McGregor aren't expected to step on the scales until 3. If the press conferences and build up to the fight so far are any indication, the weigh-in should be nothing short of entertaining.