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The models and actresses of Hollywood's elite are undoubtedly known above all else for their skill in acting and entertaining, luminous beauty, a slew of awards and award nominations, and a number of other extraordinary things that us mere mortals can often only wonder at. But what really makes these highly celebrated women It Girls?

You're about to find out! Read on for all kinds of unexpected facts and interesting tidbits when it comes to the lives and careers of Hollywood's It Girls at every age. (PS. We adore you, Meryl.)