Most adjectives come after the noun. There are some, however, that come before the noun. These are adjectives that refer to beauty, age, goodness, and size. eg. jeune fille, gros chien. BAGS is an easy way to remember. http://french.about.com/od/grammar/a/adjectives_4.htm
I'm a spanish native, as in spanish, french has common roots with latin (italian and portuguese too), in fact adjectives can be used in before or after the noun, depends mostly of the common use than a rule.
use it before, when you want to remark that caracteristic of someone or something.
i.e: ... une fille jolie... i.e: ... (what a) ... jolie fille...
I hope it helps.
Thanks. I was wondering about whether adjectives came before or after a noun too. So most come adj come AFTER the noun like: La robe rose (The red dress)
But For: Beauty Age Goodness Size
It's like this: La jolie fille (the pretty girl)
Just, what is Goodness? In the About.com site it states "vagues" as an adjective that comes before a noun.
Nevertheless, for me here there was 2 examples: "tu es une jolie fille" (related to beaty, so before the noun) and "tu es une femme parfait". The last one is related to goodness and beauty, but it was not before the noun. So i don't know if I got it, but there are some exceptions in the exceptions.