The 23-year-old One Direction singer visited Great Lakes Tattoo in Chicago on Saturday (19.12.15) where he got a number of new inkings, including a mystery tattoo on his rear.
A picture uploaded to Snapchat shows the singer lying on his stomach with his trousers pulled down while his tattoo is being done.
When asked by fans on Instagram what inking Tomlinson got, tattoo artist Erik Gillespie replied: "I tattooed him, he got several tattoos.