Billboard posted an article sorting pop stars into what Hogwarts houses they though they'd be in, here are the important ones since I can't post the whole article
Quote:
Beyoncé - Gryffindor. Courage, chivalry, determination... if the music industry needed a wizard to save it like Harry Potter, it would probably be Beyoncé. She's a perfect fit for Hogwarts' most heroic house, which is also known for occasional short tempers, as Solange would attest.
Katy Perry - Gryffindor. "Baby you're a firework… and you're gonna hear me roar!" When you've written as many motivational, self-help hits as Katy, there's nowhere to go but the land of the brave.
Justin Bieber - Gryffindor. Hogwarts' house credos tend to focus on positive traits, so let's forget about Bieber's hedonism for the moment. In a more positive light, Gryffindor's bravery to the point of recklessness could explain Bieber's love of skateboarding, drag racing and, you know, music.
Jay Z - Slytherin. Shrewd, resourceful and ambitious to no end, Jay Z joins his Watch the Throne collaborator in Slytherin house. "A certain disregard for the rules" was also noted by Albus Dumbledore as an old Slytherin trait; remember Magna Carta Holy Grail and a little deal with Samsung?