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Kim Kardashian-West turns 40 today (Oct. 21). Did you know 43% of women, aged 25-35, are influenced by what Kim wears?

In fact, 7 in 10 women say seeing a celebrity wear vintage or a recycled look encourages them to shop second-hand.

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Last year, the Guardian reported 64% of women were willing to buy pre-owned pieces and, it is thought by 2028, 13% of the clothes in women’s wardrobes are likely to be second-hand.

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The UK's saveonenergy.com/uk/ analyzed 50 red carpet fashions to find out which celebrity is the greatest influence.

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Kim placed No. 4 on the list of vintage red carpet icons behind Jennifer Aniston (No. 1), the Olsen twins and Reese Witherspoon.

To celebrate Kim's 40th milestone, we have compiled some of her top 40 vintage red carpet outfits below.