La Ciofolina + Grigolo + Maestro Chung = Sweetest cast ever
Totes check out, in the video, around 3:14, the special appearance by the immense Janine Reiss, greatest living French opera voice coach and all-out legend. At 4:31 la Ciofolina, obviously delighted, says, "Mamma mia, who's that hot boy? A flamenco dancer?".
And by the way, Grigolo phototweets, too. Here you can see him with another Reiss alumnus: