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Reese Witherspoon, Prince William, and more really excited stars!

By Katie Mathewson Slide 2 of 16

We hate to be the ones to tell you this, but when Carly Rae Jepsen was greeted by hoards of screaming fans, she wasn't actually as thrilled as she looked. Carly practiced this look in front of the mirror until she achieved the perfect degree of mouth gaping. Don't believe us? Look at her eyes -- totally emotionless.
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