Stevie and Prince

[trackaghost]

The mention of the song Thousand Days made me think of this.
I have a couple of questions about Stevie and Prince and I hope someone can help (sorry if this subject has been raised before).

Firstly, there's a demo floating around called All Over You allegedly by Stevie and Prince. Is this for real? Does anyone know? sometimes I think it's authentic other times I don't know.

Also I've heard the song Thousand Days is about Prince. Is that true? I remember the little bits she said about Prince in VH1's Storytellers and in that Spin interview with Courtney Love, but often what Stevie says doesn't make sense!
Were they friends and what exactly happened?! I know she was at the Purple Rain premiere because I've seen pictures of her attending (in an awful white dress!).

Very curious about this!

Thanks in advance guys and I hope you can help!