Taken from www.ircspy.com

"Another internet worm was released through IRC networks. The worm is disguised as a .jpg picture named Britney.jpg from Angelfire. Whatever you do do not open britney links in Internet explorer.
An exploit taking advantage of holes in Internet Explorer along with Windows Media Player ensures the worm free passage to your computer, where it starts deleting system files and destroying the registry.
The effect of this is: no shortcuts work, no programs, except those already running will work. If mirc is running it will proceed by installing a script that announces the url to britney.jpg in all the channels you have joined. Some have mentioned that it even uploads sites.dat from your FlashFXP directory."

I got this from someone on IRC, I wouldn't adivse clicking it, although I have heard its already been removed.