A spam-driven scam has hit Snapchat, the popular picture-chat app for Android and iPhone, and it's fueled by photos so sleazy, you won't believe they're free.

The app allows users to control their naughty texts by automatically deleting sent photos after 10 seconds.

While some users swear that Snapchat is more than just a convenient way to cover up compromising photos, this spam campaign certainly takes advantage of the app's racy reputation. [See also: How to Safely Send a Digital Valentine]

This week, Snapchat users who had never changed their default settings to "private" started receiving unsolicited "snaps" from "Honey.Crush9" and her scantily clad friends.