Bikini model Serena Kozakura told a court her breasts were too large for her to fit through the hole.
Miss Kozakura was convicted last year after a boyfriend said she had kicked in the wooden door of his room and crawled inside – because he was with another woman.
But in her defence the 38-year-old model told the Tokyo court that the man had made the hole himself before accusing her.
When she appealed this week her defence lawyer held up a plate showing the size of the hole and said she could not possibly have squeezed through it with her 43in bust.
“I agree,” said Tokyo High Court presiding judge Kunio Harada after casting his eyes over the model.