Kate Upton has opened up about the things she believes make a woman look sexy. The former Sports Illustrated cover girl, who has been making waves as a high fashion model of late, says looking effortless is the key to sex appeal. She recently tweeted a number of makeup free photos of herself. Speaking in the new November issue of Cosmopolitan, she says: ‘To me, what’s sexy is when you look like you’re having a good time. That, and when you look effortless and have messy hair. Maybe it’s all about effortless beauty? Read more.