Smile - Barbara Streisand & Il Volo

The Italian pop-opera ensemble Il Volo joined her for Smile, then did two songs by themselves, including a rousing O Sole Mio. "Take that, Justin Bieber!" she joked, referencing the teen trio's tender age.

O' Sole Mio > http://www.youtube.com/watch?v=23l67Cu9S8w&feature=share&list=UL23l67Cu9S8w