She's got the eye of the tiger, and that's why Katy Perry‘s "Roar" music video has skyrocketed to 4 billion YouTube views, ...

Tickets for the 16 new shows will go on sale on Saturday, January 29, at 10 a.m. PST - the same day Katy returns to the "Saturday Night Live" stage for her fourth appearance as musical guest.

The pop icon is ready to star in her own one-off special, Katy Perry: Night of a Lifetime, which will be broadcast on ITV1 and ITVX tonight (Saturday ... Firework, Roar and I Kissed A Girl.