The hand-written letter was brought forward on Wednesday at a special Beatles memorabilia day held at The Beatles Story exhibition in Liverpool when auctioneers Julien's Auctions were putting value on The Beatles' items
Lennon, which was announced at New York Comic Con over the weekend by IDW Publishing, is adapted from the 2010 novel by French author David Foenkinos
The celebrities take turns to sing a line from the John Lennon classic. Priyanka sings two lines in the song. The first, "imagine there's no countries," as a duet with model Suki Waterhouse, and the second, "a brotherhood of man," as a solo.
The Beatles star used it to record the Paperback Writer song.