Katy Perry let the world know who she was voting for when she rocked out at a campaign rally for President Obama in Las Vegas on Wednesday. Find out what the President had to say about the "Teenage Dream" singer! Plus, Kanye West took dressing down to a new level when he wore sweatpants to a Versace party in NYC, and we're taking a look at some of the funniest tweets of the week. Which celeb tweet made you LOL? Let us know on Facebook or Twitter!