sensationalist

Short definition from Wiktionary

Adjective

1. 1
   Sensationalistic; tending to sensationalize; characterized by sensationalism (the use of exaggerated or lurid material in order to gain public attention).

Noun

1. 1
   One who indulges in sensational behavior or action.
2. 2
   One who believes or espouses the philosophy of sensationalism.