Abu Hurayrah (Radiallahu anhu) says:
"Rasulullah (Sallallahu alaihe wasallam) was so clean, clear, beautiful and handsome, as though his body was covered and molded in silver. His hair was slightly curled.": (PT)
English reference (PT): Book 1, Hadith 11 (PT)
Arabic reference (PT): Book 1, Hadith 12 (PT)