Quote Originally Posted by Throbert McGee View Post
"Любимица учителя (учительницы)" is the equivalent of "teacher's pet," if I'm not mistaken.
You are not mistaken as such, the only thing is that it can be used in a positive way, too. The same goes for masculine version: любимец учителя. If you want a definitely derogative (in this context) form you use "любимчик", no matter is it a boy or a girl.