United Kingdom, May 9 -- Josh Hartnett's children mock him for "being an American".

The 'Fight or Flight' actor - who has four kids, who were born in 2015, 2017, 2019, and 2024, with wife Tasmin Egerton - lives in the UK with his family and admitted his brood never miss a chance to poke fun at him for being "a foreigner".

He said on 'The Tonight Show Starring Jimmy Fallon': "My kids love to give me crap about being an American because I'm the only American in our house. I'm a foreigner in my own home.

"My middle one does a really good impersonation of me, [and] will just kind of turn to me and be like, 'I'm Daddy, and I like pizza and I won't mow the lawn.' As American as it gets."

Despite his years in the UK, the 46-year-old actor's ...