groupie

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.

In mainstream rock youth culture, female fans had only submissive roles in the consumption of rock music: they could be teenyboppers, and when they grew older, groupies, with the groupie role providing a real-life extension of the sexualized hero worship of the teenybopper.

2000 October, The 100 Sleaziest Moments in Rock, Spin, page 102, Although Pamela Des Barres, rock′s most famous groupie, was passed around like a loose joint at a be-in, she maintains today, “There was no hierarchy. The groupies were not considered less than the musicians. We were muses.”

Any dedicated fan of something.

A bit of an eclipse groupie, he had paid the thirty guineas fee to join the BAA's first expedition, to Norway, in 1896.

A group captain.

In traditional military fashion our "Groupie" (group captain) called us to attention, exchanged salutes with his German opposite number, then handed the parade over to him.

A group photo including the photographer; a group self-portrait.