Justin Bieber and Floyd Mayweather Jr. are on another man date! But this time, they're reserving the pedicures and massages to have a one-on-one round in the boxing ring. 

The "Confident" singer, whose Instagram profile photo is confusingly of Mona Lisa, uploaded a photo and video Thursday night of the boxing session. Looks like Justin has got himself a new trainer... who also happens to be a five-year world champion, because, well why not?

The pro boxer stayed covered up during his training session, while Biebs, of course, used the opportunity to show off his impressive number of tattoos, including a full sleeve on one arm.

See the video below:

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The seemingly unlikely friendship goes back to 2012. Apparently Floyd's daughter is a huge fan of the pop star. Fourteen-year-old Iyana's Twitter avatar is even a photo of her and Justin.

Mayweather's former pal 50 Cent actually explained the Justin-Floyd connection to MTV two years ago.

"Justin is also a Floyd fan," the rapper shared. "They love the sport. A lot of people like it and haven't actually made contact or received anything to make them feel like it was cool or comfortable enough for them to come. When it actually happens and it goes down like that, it feels good. When they get a chance to see different genres, different people, everybody's excited. Floyd's daughter, Yaya, she saw half the fight, the other half she was looking at Bieber."

It is unclear how long the two have been training together, but they have been close for years and are often spotted hanging out together. Justin is usually seen supporting Floyd's fights. He and Lil Wayne accompanied the boxer to the ring in May for his fight with Marcos Maidana. Yup, the same event he brought Kylie Jenner to. Last September, he also escorted Floyd to his match with Saul "Canelo" Alvarez.