Tony Bennett says his duet album with Lady Gaga will be released in September.

The veteran crooner previously teamed up with the 'ARTPOP' star for the song 'The Lady Is a Tramp' in 2011.

A full album between the somewhat unlikely pair has long been mooted, but it has suffered delays.

However, Bennett told Showbiz 411 that his Gaga duet record 'Cheek to Cheek' will see the light of day in September.

The 87-year-old added: "Wait til you hear her voice. She’s a real singer."

Lady Gaga meanwhile is due to head out on her artRave: The ARTPOP Ball world tour from May 4.

The run will open in North America before later heading to Europe from September.

Watch Tony Bennett and Gaga team up below: