When does buttercup become the most beautiful woman in the world The princess bride?

In "The Princess Bride," Buttercup becomes the most beautiful woman in the world when she is described that way by Westley, who loves her deeply. This transformation is not about physical appearance alone; it reflects how her beauty is perceived through the lens of love and devotion. Ultimately, it's the emotional connection and the bond with Westley that elevates her to that status in the story.