Charli showed up for a surprise performance at Aspire Pacific Academy's homecoming dance to perform her hits "Boom Clap," "Fancy" sans Iggy Azalea and "I Love It," the mega-hit she wrote for Icona Pop.

Later, Charli, wearing a slip dress and a tiara, showed she's not too cool for school by manning the DJ booth. Boy, do we feel bad for anyone who stayed home sick that day.