Socialite

Noun

 * 1) a person (more often a woman) of social prominence, considered to be an influential figure
 * 2) a person who goes to fashionable parties and is often written about in the newspapers, etc.

Thesaurus
Beau Brummel, arbiter of fashion, clotheshorse, clubman, clubwoman, dandy, deb, debutante, fashion plate, fashionable, fop, man-about-town, mondain, mondaine, subdeb, subdebutante, swinger, taste-maker, tone-setter, trend-setter