The picture, taken by top fashion photographer Tony McGee in 1999, was originally meant to promote her anti-landmine charity.
But later Heather backed out from having the pictures published because she thought the former Beatle might take a pretty dim view if suddenly a load of nude pictures of her came out, a source said.
"But Heather figured Paul would take a pretty dim view if suddenly a load of nude pictures of her came out. It wasn't just this shoot she worried about—there was the infamous porn-style German sex manual she starred in too,” News of the World quoted a source, as saying.
"Quite a few people got phone calls and she made it very clear that the McCartney legal team would come down like a ton of bricks if the pictures ever went public," the source added.
Mucca claimed in her book, ‘Out On A Limb,’ that she left raunchy modelling at the age of 17.
"Posing topless just didn't satisfy me," she said.