My best friend is annoying me

K I have this friend like a really good friend
But shes been pissing me off lately because shes sems to be doing everything that im doing (it sounds juvinile(sp) but she copying me) like when I got my nails done she got hers done, when I got my hair cut she cut hers, I got my belly button pierced now shes piercing hers, and so on
And its really starting to p*ss me off

So I dont know if im overreacting or if I should tell her to stop or what to do
Please help?

lol dont necessarily take this advice but I just did these kind of things to win those childish games...do something she wouldn't do, die your hair, bunjee jumping...etc.

haha...ok im going to try that