Could people see those photos?

I had a weird paranoid moment when some woman I've never met, named simply "Kate," added my picasa album as one of her favorites, so I made my albums unpublic--but in the past, people to whom I've given the link could look at my unlisted albums anyway. A friend said she couldn't see my pics--can anyone else? Let me know if not and I'll make them public again, Kate be damned. There are some good ones.