groupie

Short definition from Wiktionary

Noun

1. 1
   A fan, especially a young female fan of a male singer or rock group; a person who seeks intimacy (most often physical, sometimes emotional) with a celebrity, usually a rock 'n' roll artist or band member.
2. 2
   Any dedicated fan of something.
3. 3
   A group photo including the photographer; a group self-portrait.
4. 4
   A group captain.