Pop beauty Katy Perry has revealed that rehearsing and training for her new live show is absolutely exhausting and she's struggling to find the time for food. 

During a new interview with Billboard magazine, the 'Roar' sensation confessed that while she's meant to be eating at two-hour intervals, her indecision means that this is hard to achieve so she often finds herself 'starving' and running on little energy:

"I am exhausting so much energy right now. For eight days straight, I've been conditioning -- just going, going, going at the height of my physical capabilities. I'm supposed to eat meals every two hours, but it takes me an hour to think of what I want to eat, so by lunchtime, I'm starving. I'm just so hungry all the time."

Perry also opened up about the creative process that drove the making of her forthcoming new album (October 22), 'Prism', adding: "I was really inspired by this little six-minute thing by Eckhart Tolle where he speaks about loss. When you lose something, all your foundations crumble-but that also leaves a big hole that's open for something great to come through."