Scarlett Johansson holds two passports. One is American. What is the other one<?

Explanation

Scarlett Johansson (b. 1984) is an actress and singer with dual U.S. and Danish citizenships. Johansson broke through with her roles in The Horse Whisperer (1998), Lost in Translation (2003) and The Girl with a Pearl Earring (2003). In 2008, she debuted as a singer with "Anywhere I Lay My Head", which is a cover album with songs by Tom Waits.