Justin Bieber's got some friends you really don't wanna tangle with—like reigning WBC Welterweight champion Floyd Mayweather.
The "Confident" crooner was right by Mayweather's side Saturday night in Las Vegas just before the boxing great went toe-to-toe with current WBA Welterweight champion Marcos Maidana.
The Biebs posted a pic of himself with Mayweather on Instagram along with the caption "#moneymayweather."
The snap shows the two standing side-by-side as Mayweather flexes a fist and a brooding Justin strikes a pose in a T-shirt, shades and hat.
A few minutes later, Bieber shared a second snap on Instagram of the two with Weezy, aka Lil Wayne—no caption needed.
Justin's been having a blast in Sin City over the past couple of days.
After getting pampered with Mayweather Friday, he hit the Palms Casino Resort and Palms Pool Day Club and "Ditch Fridays" season opener without the rest of the money team in tow, a source told E! News exclusively.
"Since Vegas is a 21 years and over town, it was the closest way for him to experience the party," the eyewitness said.
After arriving with his pals around 4 p.m, the Biebs went shirtless at the bash, spending most of his time with water in hand.
In case you were wondering, the fight between Mayweather and Maidana was set to get underway at 9 p.m.at the MGM Grand Garden Arena.