WordNet (r) 3.0 (2006):

headliner
    n 1: a performer who receives prominent billing [syn:
         headliner, star]

Moby Thesaurus II by Grady Ward, 1.0:

18 Moby Thesaurus words for "headliner":
   danseur noble, diva, feature attraction, first tragedian,
   heavy lead, hero, heroine, jeune premier, lead, leading lady,
   leading man, prima ballerina, prima donna, principal, protagonist,
   singer, star, superstar