Lady Gaga, sporting a black and white wig, red trousers and a red dress with leopard-print sleeves, was given a key to Taichung city by the mayor at a ceremony attended by hundreds of enthusiastic supporters.
"On behalf of Taichung, I now declare today 'Lady Gaga Day'...which also belongs to all of her fans," mayor Jason Hu said.
Earlier in the day, hundreds of her fans known as "Little Monsters" defied summer heat to parade on the street dressed in costumes and wigs.
Lady Gaga Day Ceremony
Lady Gaga Taiwanese Concert