Gwyneth Paltrow has a secret to getting in shape after pregnancy - girdles.The screen beauty, who is married to Coldplay rocker Chris Martin, started wearing the waist-cinching garments after giving birth to son Moses last month.She has also started a strict diet to help shift the extra pounds.A source told Britain's Grazia magazine: "Gwyneth gave up wheat, sugar, caffeine and dairy straight after Moses was born. And she's also wearing a special girdle designed to pull her waist back into shape."She follows quite a strict diet anyway, but she got her figure back quickly after having her daughter, Apple, and now wants to achieve the same following Moses' birth."It isn't the first time the actress has admitted turning to some secret support.After having her Apple, now two, Gwyneth confessed: "I wore two girdles! It's a great trick. That's how all the Hollywood girls do it.

"There are these great things called Spanx, which are like bike shorts, and they just squeeze you in. It's terrific."