Kim, they are both so adorable!
I love Italian names, maybe I can help you out with some nicknames for Pavarotti and Bocelli.
Isn't Pavarotti's first name Luciano? You could always shorten that to Luke or Luca.
For Bocelli you could shorten it to Bocce (say it Botchi, it's an Italian game like lawn bowling) or Baci which is Italian for kiss.
You could also give them other Italian names like Luigi and Mario, or Marco and Polo.

I do know that Jen has an adorable black and white foster kitty named DaVinci so you can't use that name.