Possible Clues:

• Childish rebuttal
• Retort to "Am not!"
• Joe Cocker's 'You ___ Beautiful'
• Rebuttal to 'Am not!'
• Response to "am not"
• 'You ___ busted!'
• 'Am not!' rejoinder
• ''You ___ Beautiful''
• Joe Cocker's "You ___ Beautiful"
• ''You ___ Beautiful'' (Joe Cocker hit)