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Sir Paul McCartney views his own abstract painting, called Big Heart, which he has dedicated to his wife-to-be Heather Mills, which will go on display along with other examples of his work at Liverpool's Walker Art gallery. * ... in an exhibition called 'the art of Paul McCartney. (Photo by Phil Noble - PA Images/PA Images via Getty Images)

Sir Paul McCartney views his own abstract painting, called Big Heart, which he has dedicated to his wife-to-be Heather Mills, which will go on display along with other examples of his work at Liverpool's Walker Art gallery.  * ... in an exhibition called 'the art of Paul McCartney.   (Photo by Phil Noble - PA Images/PA Images via Getty Images)

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381291 05: Paul McCartney''s painting called "Big Mountain Face, 1991" is displayed at his art exhibition November 2, 2000 at the Matthew Marks Gallery in New York City. The title of the exhibit is called "Paul McCartney: Paintings" and they are works from his new book of the same title. (Photos by Arnaldo Magnani/Liaison)

381291 05: Paul McCartney''s painting called "Big Mountain Face, 1991" is displayed at his art exhibition November 2, 2000 at the Matthew Marks Gallery in New York City. The title of the exhibit is called "Paul McCartney: Paintings" and they are works from his new book of the same title. (Photos by Arnaldo Magnani/Liaison)