British-born actress Mischa Barton is set to be sworn in as an American citizen next month (FEB06).

The OC star had to pass a special test in order to be granted citizenship and was intimidated by the process.

Barton recalls, "I was really nervous about it because they make it sound so difficult. It turns out they (the questions) are like, 'What colours are the American flag?'"

The actress will be sworn in with 4,000 other new citizens at an upcoming ceremony.