Answer: letthemeatcake

AnswerCrossword Clue
LETTHEMEATCAKEAttributed Marie Antoinette rejoinder
LETTHEMEATCAKEUnifying statement of what a French queen might say?
LETTHEMEATCAKESupposed Marie Antoinette line
LETTHEMEATCAKEDietary advice from Marie Antoinette