For the week of February 13th, Katy Perry is still holding the top spot on the Billboard Hot 100 charts with her infectious Prism single "Dark Horse" featuring Juicy J. But the big news on the charts is Pharrell Williams' big jump to the no.2 spot, replacing Beyonce's sexy track "Drunk In Love" with husband Jay Z. Taken from the Despicable Me 2 soundtrack, Pharrell's "Happy" could very well take the number one spot away from Perry next week. Rounding out the top 3 is Jason Derulo featuring 2 Chainz's "Talk Dirty", which was at #4 last week, while A Great Big World's "Say Something" continues to climb the chart as well at the fourth spot, thanks to the help of Christina Aguilera. Another chart-riser is Passenger with his crestfallen tune "Let Her Go", sitting at number 5 this week on the Hot 100. Be sure to check back next week and see who's rising and falling off the Billboard charts.