4. Floyd Mayweather and Justin Bieber

Floyd Mayweather Jnr may well be regarded as one of the most skilled boxers in the history of the sport, but the pound-for-pound king has damaged his reputation somewhat by becoming pals with Justin Bieber.

The pop superstar escorted Mayweather to the ring for his victory against Saul Alvarez in September, while they have recently gone into business together.

David Beckham