f(x) Amber made a very surprising promise of wearing miniskirt and heels during Ailee's comeback showcase of September 25.

During the Q&A portion, Amber made a surprise phone call to congratulate her friend Ailee for her comeback. Out of nowhere she stated, "If Ailee's album becomes no.1, I will wear miniskirt," in which Ailee replied, "You should wear miniskirt with high heels."

Are we finally seeing Amber in skirt? Let's hope for Ailee's album to be no.1 then! Meanwhile, the broadcast of Ailee's showcase will be today at 6PM and 11PM at MBC Music.