If you are from UK, then just log in and you should have it.
If you aren't from from UK, then follow these steps:
1) Go to UK proxy like goproxing.com/
2) Paste stardoll link (http://www.stardoll.com/) into proxy bar and hit enter or click go!
3) Log in stardoll, wait until page loads and leave proxy!
Mirrorball should be in your suite!