The singer, who had been promoting her new perfume at Harrods next door, was seen leaving the Knightsbridge embassy building dressed all in black and wearing a pointed witch’s hat…

Earlier, singer M.I.A. had tweeted a message to Lady Gaga saying: “If ur at harrods today, come visit Assange at the Ecuador embassy across the st. im there. Ill bring TEA and CAKE (sic).”