Kings of A&R — Katy Perry could outsell Lady Gaga by double more info

411 Mania — "Roar" is a big hit and Gaga sells okay too… more info

Topix — Who joined Jay-Z for his final Legends show in Miami? Did Toni Braxton have a wardrobe malfunction? What makes Katy Perry "Roar" in real life? Toni Braxton suffered an embarrassing wardrobe malfunction on stage this weekend. more info

People.com — Plus: The Mean Girls joke heard 'round the world more info

Consequence of Sound — So solid Em, Katy Perry, and R. Kelly aren't even in the Top 5. more info

411 Mania — Plus an update on Lady Gaga's "Applause"... more info

411 Mania — Beware the wrath of Katy... more info

USA Today Music — Singer talks about 'Who You Love' duet featuring his pop star girlfriend. more info

411 Mania — Is Nine Inch Nails' "Copy of A" a true original? Is Katy Perry's "Roar" more of a meow? Do we like Justin Timberlake's latest single? 411's Sean Walker and Robert Cooper listen to these tracks and more! more info

Sky News — The 'I Kissed A Girl' singer questions opposition leader Tony Abbott during a 'respectful' disagreement on a Sydney radio station. more info