It turns out a lot more happened on that fateful day with Katy Perry and Ruby Rose... According to footage obtained by TMZ on Wednesday, the pop star and, reportedly, the Orange is the New Black alum crashed a high school prom at the Grand Hyatt in Melbourne on August 15, 2010 - just hours before the alleged sexual assault. In the clip, Katy grabs a mic and sings Beyoncé's Single Ladies while a bunch of teens dance. She also attempts to bust a move with them, as the crowd takes a few seconds to realize the A-lister is at their prom.