What happened to the original Britney?

I know this post is about 5 years too late but I think Britney Spears' best songs were when she was more about singing catchy tunes, and dancing in the music videos. I still like listening to these songs from time to time. Now, its mostly about how much skin she wants to show, her sexual nature (more info than most of us really care about, especially since she's married, and possibly pregnant), and the singing has just been reduced to singing/whining through her nose.