5. Selena Gomez, because Justin Bieber is creeping on her again.
Justin Bieber and Selena Gomez have been broken up for years. But Bieber keeps proving he is a true 22-year-old millennial by frequently using social media to creepily remind her, and the entire world, of their history. This weekend, he posted a throwback photo on Instagram of the two of them kissing, back when he was a much scrawnier twig of a man.