Katy Perry's 'Roar' knocks 'Blurred Lines' out of No. 1 spot

Katy Perry's 'Roar' knocks 'Blurred Lines' out of No. 1 spot

Katy Perry Ties For Most Pop Songs No. 1s

Violet Zaki Mix & Match Workout

On the Charts: Maroon 5 takes over, Taylor Swift hits No. 1, Kelly Clarkson stuck on the 'Dark Side

Rixton spoofs Miley Cyrus, Katy Perry, and Robin Thicke in 'Make Out

IN THE MIX WITH HK™: 2013