hmm that is pretty over the top.
honestly she shouldnt be doing that when she has a bf.
i have alot of friends who just love and adore rob pattinson, but they all are single.
the ones that are in a relationship, they see their bf as rob.
so you really should concider talking to her about it. or if yu think yu don wan put yourself down.. and show that youre jealous. then pick an actress or a singer, like jessica alba .. and do the same thing your gf doing now. then she will know how it feels. write that youre jessica's lover, cuz shes married. and write jessica's girls name under your children.
it might sound silly to yu, and yu may not wan to do it cuz shes doing it, but this is the only way for ur gf to really understand wat yu r going thru.
but still its up to yu.
i like rob alot too, but around my bf i cannot say or mention him. and i cannot dare to put his pic as my dp on my cell phone or facebook or anyting lik tht. and my bf loves this arabic singer who is lik hell hot, but he never mentions her or never does anyting tht i wudnt like, cuz we both have been thru wut ur going. and it did help me to make him understand wat it feels like to be jealous, and how its annoying to see other famous and hot chiks pic all around everywhere.
so, talk to her.. or either do the same thing she is doing.
goodluck.