WATCH: Lady Gaga's performance at Tony Bennett's Birthday concert.


The star-studded birthday bash for the legendary American singer Tony Bennett, which was held at the Radio City Music Hall last August, was finally shown as a primetime TV special on NBC on Tuesday night (Dec. 20).


Lady Gaga, who have built an incredible friendship with Bennett, also performed for the 90-year-old singer. During the event, she delivered an amazing performance of 'The Lady Is A Tramp' and 'La Vie En Rose'. You can watch the performances below.


The Lady Is A Tramp:

La Vie En Rose:


When asked about Lady Gaga, Bennett told the Associated Press: "Well, we just love one another. We're both Italian-Americans and we understand one another. I love her family. I love everything about her and, you know, we just get along."


To further celebrate his 90th birthday, Tony Bennett have also released an album under Columbia Records on December 16th titled 'Tony Bennett Celebrates 90' which also featured performances from Lady Gaga. You can get a copy of the album HERE.