With his distinctive woolly chullos, scallywag persona, and "na na nai" catch phrase, North London MC/vocalist Dappy was instrumental in the commercial breakthrough of his urban-pop trio N-Dubz, but has since become more renowned for his questionable off-the-field activities than for the band's series of multi-platinum albums. Born Costadinos Contostavlos in 1987, he grew up in Camden Town, where he attended a number of schools before being expelled for truancy and eventually dropping out of education altogether by the age of 15. Encouraged to change his ways by father Byron, ...