Baby elated by Katy Perry's 'Dark Horse'

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Babies really are amused by the simplest things. If only we could all be like that, right?

This video has been making its rounds on the internet the past couple of days, and you can't help but smile.

Check out this baby's reaction to Katy Perry's "Dark Horse."

The Youtube video has been viewed more than 13 million times and Katy Perry event tweeted it to her followers!