The eccentric singer, 24, wore a long black crepe dress and a black veil to an award ceremony in Germany, where she picked up three awards for her music.
To add to the Halloween fancy dress feel, she also wore some very bizarre platform shoes which had no heels, meaning that she had to be helped up steps and other obstacles by her people - or should that be minions?
Lady Gaga scooped Best International Female Artist, Best Single Of The Year for single Poker Face and Best International Newcomer at the ceremony.
While we're all for scary witches, the Poker Face star may have been better going for some sexy fancy dress.
Girls tell us they love the Magic Spell Witch Costume from Leg Avenue thanks to its Gothic but girly feel.