Katy Perry is with a fresh spin on the Billboard Hot 100: Katy Perry is once again atop the Billboard Hot 100 singles chart with her hit "Firework," which notched its third consecutive week at number one. Bruno Mars comes in at number two with "Grenade," climbing up a slot from the previous week. Rihanna's "What's My Name?" featuring Drake slipped a spot to number three. The top five is rounded out by Pink's "Raise Your Glass" and Ke$ha's "We R Who We R."

Bruno Mars And Rihanna both have other tracks in the top ten as well. Mars' "Just The Way You Are" and Rihanna's "Only Girl (In The World)" are numbers six and seven, respectively. Lil Wayne scores a top ten debut with his "6 Foot 7 Foot," featuring Cory Gunz. It comes in at number nine. The Black Eyed Peas sit at number eight with "The Time (Dirty Bit)" and Nelly is at number ten with "Just A Dream."