Ogre or Princess?

I watched Shrek last week and will watch it again tomorrow at 7pm if anyone is interested in watching with me. Anyway a question has been plaguing me as I have been reflecting on the movie: Is Fiona a human or an ogre? or Is her human form the curse or is her ogre form a curse? Now if you have not finished the movie and cannot stand spoilers STOP reading right now...Ok seriously I am going to "ruin the ending for you"...Look away...hit the little red "X" on your brouser...You have been warned! Fiona turns into an ogre through her kiss with Shrek because it is "true love's first kiss". What a warm and happy ending living out a curse. Or is it? Let me know what you think.