Giulio Marcocchi/Sipa
Sure, the theme of the night was "Carn-Evil," but this pop sensation took it way too far with her hideous clown collar and face art, which, BTW, looked an awful lot like a bad Lady Gaga knockoff.
This singer was already on our bad side for wearing what looked like bat wings to a party last month. Girlfriend needs to get it together!
Find out who it is in mystyle's Fashion DUI gallery!
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...and sound off on more star style in our Fashion Police gallery.