Even though the two are nearly twenty years apart in age, they've been friends for a couple of years. They even filmed a funny video for Conan in late 2014 where Mayweather teaches Bieber to box. Spoiler alert: Bieber gets crushed.

Bieber talked to Complex about how Mayweather often says or does things for hype. "With Floyd, he's just an image," he said. "I think he may not do the best job at being humble, but that's not his job. I mean, it's good to see people that are just humble and cool and down-to-earth and chill, but he's trying to get pay-per-view numbers. He's saying wild stuff just for attention.