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Kristen Bell really loves sloths. So, when her fiance, Dax Shepard, decided to surprise her with one on her birthday, she was so overcome with emotion that she had a "full-fledged panic attack."

The now 31-year-old actress appeared on 'The Ellen DeGeneres Show' recently, revealing her passion for the tree-dwelling animals. She described knowing that a sloth was nearby and how she was bursting with excitement.

"I didn't know how to process that, because my entire life had been waiting for this moment where I would get to interact -- I'm serious -- with a sloth," she told the talk show host and the audience.

She added, "The first thing you should know about me, if I'm not between a three and a seven on the emotional scale, I'm crying. [I'm crying] if I'm too sad, I'm crying if I'm too excited."

And cry she did. Dax happened to capture video footage of the star bawling over the prospect of hanging out with a sloth, making us love Kristen more than we already do. Check out the clip from 'Ellen' below. Have you ever been so excited about something that you burst into tears?

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