Why do girls tend to go for the 'fake'plastic' look?

My girlfriend tends to wear a lot of make up, which is just ridiculous, wears extensions, eyelashes, gets her nails done regularly and does this pout with her lips whenever we go out, i mean theres no need. Shes a model but wastes a lot of money on stuff she doesn't need! I mean shes beautiful without all that slap and to be honest i dont like the stares shes gets from other men does my head in! so why do girls wear such amount of fakery when they clearly dont need it?