Keira Knightley is an Oscar nominee. She is very famous. She’s been on the covers of many, many magazines. And yet people often assume she’s Natalie Portman. Knightley told Graham Norton on his show, “I get chased through airports. She must get chased a lot.” Knightley also told the talk show host she also gets mistaken other stars like Kate Winslet, adding, “The one that’s quite surprising is Britney Spears.”