Facebook API - How do I get a Facebook user's profile image through the Facebook API (without requiring the user to "Allow" the application)

I'm working on a [CMS][1] that fetches a user's profile image from their Facebook [URL][2] (that is, http://facebook.com/users_unique_url). How can I accomplish this? Is there a Faceboook API call that fetches a user's profile image URL without the user needing to *Allow* the application? [1]: http://en.wikipedia.org/wiki/Content_management_system [2]: http://en.wikipedia.org/wiki/Uniform_Resource_Locator