Today on This Week in YouTube, Leah D'Emilio and Lon Harris report on the latest from Katy Perry, Sarah Palin, Sarah Silverman, Sacha Baron Cohen and much, much more. Find out what videos you should know from the week so you can impress your friends and potential lovers over cocktails tonight. You heard it here first from Mahalo Daily. Be sure to RATE and SUBSCRIBE to our YouTube channel! You could be the lucky winner of an amazing Mahalo beach towel! Remember: We're watching YouTube, so you don't have to. Mahalo!