Parvenu

 Photo  ©  Brian W. Schaller/License:  FAL 1.3

Photo © Brian W. Schaller/License: FAL 1.3

Parvenu (n.): a person who has suddenly gained a great amount of wealth, but has not yet gained the manners or class associated with wealth; new money

Ex: The try-hards and parvenus walk along Rodeo Drive as if they're something special. 

Keith Blackmerword, parvenu