Apparently "vivacity" is a valid word. I had to actually look that up, 
but no, it's listed in Wiktionary, therefore it must be real.

I would have thought the correct word is "vivaciousness" - which 
Wiktionary claims is /also/ a word, and means the same thing.

Then again, personally I would have just reworded the entire sentence. 
Instead of

   "You danced with vivacity."

I would have written

   "You danced vivaciously."

Then again, if *I* was writing about my own dancing ability, that might 
appear self-serving. ;-)

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