The 'Born This Way' star showed off the unusual fashion accessory as she left her hotel in Germany where she is promoting her upcoming album ARTPOP, reported Entertainment Wise.
Gaga teamed up her moustache look with a black inner, knickers, suspender, fur coat and her trademark platform boots.
Earlier in the day, the 27-year-old really upped the bizarre factor, hitting the streets in a gigantic triangular headpiece ahead of the world premiere of her new album.