Katy Perry's Most Memorable Music Video Looks
"Last Friday Night (T.G.I.F.)"
Before its premiere in June 2011, Perry tweeted, "I told someone about my new music video I just filmed and they responded with 'Wow, that's gonna break the internet.' ... Should I knock on wood?" In the vid, the singer debuts Kathy Beth Terry, the headgear-sporting, outrageously adorkable star of the plot.