Calvin Klein creative director Francisco Costa only wants to work with "feminine and cool" stars who have something to say.
Francisco has dressed a string of diverse high profile women, including Rihanna, Jennifer Lawrence and Rooney Mara and says he loves "natural" women.
He said: "They're all really strong, independent people. They have a point of view. They're feminine and cool. You know, they're natural.
"The person has to have a certain level of confidence. We keep our red carpet dresses simple - but always glamorous."
For Francisco, key to his designs is being timeless.
He said: "I don't want anything that can date you or that feels like you've been put in a time capsule. Calvin always looked forward, never back."
And the designer thinks it is important to work with high-profile stars, both in dressing them for the red carpet and getting them to his shows.
He told Grazia magazine: "I love it for many reasons. It brings a lot of awareness to the brand, so I think it's very important. We do it deliberately."
Tagged in Calvin Klein