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Style Evolution: Mary-Kate and Ashley Olsen

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Happy 31st Birthday, Mary-Kate and Ashley Olsen!

The child stars-turned-designers have made a name for themselves outside of TV and film with two popular fashion labels under their belt: their couture label, The Row, and their contemporary collection, Elizabeth and James.

The fashionable twins are constantly looked at for sources of inspiration from their street style to their red carpet looks. Click through to see how the duo's style has evolved!