nouvelle riche

from The Collaborative International Dictionary of English v.0.48

Nouveau riche \Nou`veau" riche"\, m., Nouvelle riche \Nou`velle"
riche"\, f.; pl. m. {Noveaux riches}, f. {Nouvelles riches}.
   [F.]
   A person newly rich. Contrasted with {old money}.
   [Webster 1913 Suppl. +PJC]