McCartney made a brief appearance in a skit where Baldwin and comedian STEVE MARTIN battled it out for the title of who has guest hosted the show the most times.

MARTIN SHORT also made an appearance as a waiter and McCartney appeared at the end of the sketch, causing a surprised Baldwin to break character and cover his mouth in disbelief.

Baldwin then dressed up as legendary singer Bennett to host THE TONY BENNETT SHOW with a backdrop of San Francisco's Golden Gate Bridge.

A visibly delighted Bennett, who recently turned 80, appeared in the skit as a regular guy who was a last-minute guest on the show when there was a mix-up.

The pair ended the sketch with a camp rendition of AMERICA THE BEAUTIFUL.

Bennett then reappeared for the closing number of the show where he did a surprise duet, singing STEPPIN' OUT WITH MY BABY with musical guest CHRISTINA AGUILERA.

Alec Baldwin performing as Tony Bennett for 'The Tony Bennett Show' with the real Tony Bennett on Saturday Night Live. USA - 12.11.06

Source: WENN