55% sureLots of sources credit Audrey Hepburn with this, and they agree with each other. The book or the speech it first came from hasn't turned up yet.
What turned up
Attributed; sourced only to How to Be Lovely (Melissa Hellstern, 2005), p. 143 — a posthumous compilation, so held at likely (no lifetime publication located this pass).
Work
collected in How to Be Lovely: The Audrey Hepburn Way of Life (Melissa Hellstern, 2005), p. 143
Occasion
brushing off the idea that she was a living legend of style
Sources checked
en.wikiquote.orgChecked using claude-fable-5, 22 August 2026Wikiquote quotes it from Hellstern's How to Be Lovely (2005), p. 143 — posthumous quote-book compilation class (Ford/Angelou test): not verified-grade evidence. No lifetime interview located this pass (WebFetch-only; search budget exhausted).