1) Admirer 2) Fan 1) An enthusiastic young fan 2) Band fan, and then some 3) Buff 4) Devotee 5) Follower, of sorts 6) Lover 7) More than merely a fan 8) Rock band follower 9) Star-struck fan 10) Tour follower 11) Warner Music Group single 
The term groupie is derived from group, in reference to a musical group, but the word is also used in a more general sense, especially in casual conversation, to mean a particular kind of female fan assumed to be more interested in relationships with rockstars than in their music. A groupie is generally considered a devoted female fan of a band or...
[Noun] An informal word for someone who is a fan of a pop group or film star and follows them around.
Groupie is slang for an ardent fan of a celebrity, especially a pop star.
[n] - an enthusiastic young fan (especially a young woman who follows rock groups around)
slang for an ardent fan of a celebrity, especially a pop star.