The `Behind Closed Doors` hitmaker overindulged during the festive season and so is planning on beginning a strict eating regime when he gets back from a skiing holiday.
He said: "I`ve really over-indulged over Christmas, but everyone does that, don`t they? I`ve probably put on a couple of kilos, so I`m going to start the caveman diet as soon as I get back to the UK. It basically involves eating just steak, nuts and vegetables for a couple of weeks!"
Peter - who has recently been on a sunshine break to Dubai with children Junior, six, and four-year-old Princess - has pledged to be more spontaneous this year and is enjoying his last-minute trip to Switzerland.
He added in his latest column for new! magazine: "I`m writing from the Swiss Alps this week as I`ve come here for a few days with my brothers Mike and Chris and my friend Nick. It`s absolutely stunning and we`re having a ball. After my holiday in the sun with the kids, I fancied a few days skiing, so I just got on the phone and booked something last minute. I`ve decided 2012 is all about spontaneity.
"We`re staying in a beautiful chalet and we`ve all been mucking in and cooking for each other. I`ve also managed to do a red run, which I`m so chuffed about."