Tony Bennett has described Lady Gaga as family, saying the pair are like "brother and sister".
The 17-time Grammy-winning US crooner became friends with the Poker Face pop star after they teamed up for a new version of the 1937 track, The Lady Is A Tramp, for his Duets II album.
"We're just like brother and sister together," he told the Stars & Stripes website.
Tony, who is in Japan to perform at the Tokyo Jazz Festival, revealed they are in talks to record a full album together. The record would include standards and jazz classics.
"She's the Picasso of the entertainment world. She's a very talented person," the 87-year-old gushed of Gaga, whose real name is Stefani Germanotta.
Tony and Gaga's previous collaboration has been a hit, attracting more than 11 million views on YouTube.
Tony, who joked that performing keeps him in shape, said he doesn't need to work with younger artists to sell albums.
"If it sounds good, people are going to buy it," he said.