Katy Perry keeps it real and tells Rolling Stone Magazine how hard it is to diet and keep her super hot body in check as she prepares for her California Dreams tour.

“After this interview I’m going to have a nice healthy breakfast,” she told the magazine. “I’m on a meal plan, which absolutely sucks – but on Sundays I get to have a cheat day where I go buck wild and eat In-N-Out Burger. Then I’ll work out, go to a vocal lesson, run through the entire set at rehearsals, go to dance rehearsal until 10:00 p.m. and then go home and sort through e-mails concerning the production. I feel like I’m training for the Olympics!”

I love to her celebrities tell the truth about how it really is the SUCK to diet and lose weight/or stay super perfect. I want to slap those idiots that lie and say they eat whatever the want and just must have a good metabolism. Meanwhile they are living on Adderall, cigarettes and Starbucks.

Yeah, I suppose if you have time to work out a few hours a day, seven days a week looking like Jennifer Aniston is easy. Jen looked amazing, as usual, at her perfume launch at Harrods in London this week and spilled her secret to looking so hot at 41.

Asked about the secret to her honed bod, the American star told us: “It’s simple. Run, work out every day. I do a lot of running – exercise is so important. Plus it’s all about balance. Work, exercise, diet, you need balance.”

“I am, perhaps, fortunate in that my career, the public awareness it brings, gives me a certain freedom in this way. But, of course, there are positives and negatives in any career, it’s not all going to be perfect.”

I get the first part…exercise and balance. But what did she mean by her career giving her freedom? I’m not being snarky…that one makes no sense to me. Is she saying that looking good is just part of the job and once you accept what you have to do it’s easy?

37 year-old Cameron Diaz looks better than most 20-somethings in Hollywood. The reason, Cam is FIT.

This week Cameron is taking a break in Hawaii before she starts a promotional tour for her new flick Knight and Day with Tom Cruise, but she recently told an interviewer the secret to her fab figure is healthy eating and regular exercise, including Pilates.

She said in a recent interview: ‘Food is one of my biggest pleasures. I love to eat. I love to cook. I love to feed people. My body functions best when I eat consistently. I pretty much eat the same thing every day for week at a time.’

I’ve always been a believer in the KISS way to eating. Keep it simple stupid. Eat simply, even if it means repeating your menu for a few days or even a week. There are proven reports out there that show people who regularly eat the same meals maintain their weight better than people who vary their diet a lot.

I remember reading in a tabloid about a year ago that Victoria Beckham only ate berries, edamame and drank champagne. I chalked it up to the ridiculous tabloid rumor that it sounds like. Though I doubt she eats very much…living on berries and soybeans doesn’t even seem real for an old-school anorexic like Vics.

But there might be some truth to it. Fox News had this blurb under their Seen and Heard column yesterday.

Victoria Beckham (sans hubby) and her three sons checking into the Hard Rock Hotel San Diego on Friday night. The family enjoying breakfast at Maryjane’s Saturday morning (Posh ordered a bowl of berries with coffee) before spending the day on a VIP tour of Sea World. The family unwound by the pool at Float, Hard Rock Hotel’s rooftop lounge —Victoria sipped on Moet Rose while her kids splashed around in the pool before dinner at Nobu and PinkBerry for dessert.