Why do Westerners like "sexy" girls more than "cute" girls?

The Western definition of beauty:

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Eastern definition of beauty:

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As you guys can see, there is a huge difference in the defenition of beauty between the East and the West. To generalize things, the West likes "sexy" girls more than "cute" girls. While girls in the West attempt to look as "tempting" to men as possible, Eastern girls tend to be the type where you want to cuddle, hug and look after.

Yet, less than a century ago, fashionable women in the West looked like this:
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I wonder why Westerners tend to prefer "sexy" girls, and what caused the transition, can anyone answer? :/