Noun

1. One who affects some behaviour, style, attitude or other condition, often to impress or influence others.

   He pretends draping things in miles of cloth is art, and that he’s an artist, but it’s always the same gimmick with different details, and he’s just a poseur.

   She only dresses like that because she thinks she is getting the boys' attention; she doesn’t even like the clothes. She’s such a poseur.