Streisand, John, Aguilera to pay tribute to Bennett

Barbra Streisand, Elton John and Christina Aguilera will help crooner Tony Bennett extend his 80th birthday celebrations next month after signing up to appear in a TV special with him.

The stars perform on a new duets album with Bennett, and he was thrilled when they all agreed to join him onstage for an upcoming 80th birthday special, An American Classic.