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Did Mary-Kate Olsen Pull A Renee Zellweger?

One of these Olsen twins does not look like the other. Last week Mary-Kate and Ashley Olsen attended the star-studded World of Children Awards looking noticeably different. Mary-Kate's appearance has created a great deal of speculation that she may have undergone plastic surgery — just like Renee Zellweger's noticeably new look.

Here's a closer look at M.K. Olsen.

The Olsen twins are fraternal, so they have never looked exactly the same. That isn't to say that there weren't times when they looked more similar to each other. Here they are back in 2010.

So is it just a combination of losing weight and not washing your hair? Or did Mary-Kate actually go under the knife?

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