Floyd Mayweather Jr.

Jestingly nicknamed "pretty boy," champion pugilist Floyd Mayweather chalked up one of the most astounding track records in boxing history when he netted 38 straight back-to-back victories (with no losses and 24 KO's). Mayweather won the title of Welterweight Champion of the World after gleaning six world championships in five different weight rankings. He achieved recognition in a much different arena in the fall of 2007, when ABC tapped him as a celebrity dancer in the fifth season of its competitive reality program Dancing with the Stars. On that series, Mayweather danced opposite Karina Smirnoff. In 2012 he served two months in jail stemming from a domestic assault.