Getty Images. Matthew McConaughey 's model girlfriend Camilla Alves has gorgeous dark hair - and she says it's because she only washes her hair once a week. The model-turned-designer, who recently gave birth to her second child with McConaughey, told America's OK magazine, "Matthew likes it as natural as possible. I try to keep my hair as simple as I can, so it can do its own thing. I try to wash my hair once a week. People think you have to wash your hair all the time, but actually, you need...
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