Actress RACHEL BILSON was left red-faced at a U.S. airport when she was stopped by security officials who mistook her for an unaccompanied minor.

The former O.C. star landed at Los Angeles International Airport (LAX) when the embarrassing incident occurred and the 31-year-old actress is worried her youthful looks will one day become even more of a hindrance.

She tells Women's Health magazine, "I know I look super-young. I was flying home into LAX the other day and the security guard at the airport stopped me and said, 'Honey, where's your family?' - I'm 31.

"Maybe when I'm older I'll appreciate it but as I get older and get wrinkles I'm worried it'll be, 'She's the weirdest looking teenager I've ever seen'."

Bilson is not the only actress whose appearance has caused a mix-up at airports - Harry Potter star Emma Watson was mistaken for an unaccompanied minor last year (12) at John F. Kennedy International Airport in New York.