In her latest new music video, “Last Friday Night," Katy Perry debuted her nerdy, 13-year-old alter ego, Kathy Beth Terry. The bespectacled Kathy Beth, donning a pink turtleneck, headgear, and a mouth full of braces, wakes up covered in streamers and other party paraphernalia with a naked boy in her bed. Recovering from her hangover, she replays the scene from the evening prior in which she hosted a rager, got a makeover, and briefly ditched her dweeby boyfriend for an athlete with a six-pack. While the video is part-‘80s throwback to a Sixteen Candles-esque party scene, it’s also a spoof on Rebecca Black’s amateur video “Friday,” which became a viral sensation. Black, an outcast and object of worldwide derision, appears in the video as the popular girl who makes over Kathy Beth.