If you've ever scoffed at the clean living, vegan diet, yoga obsessed lifestyle of Hollywood A-listers, Gwyneth is living proof that it works getting sexier and more glamorous every year.
She's scooped an oscar, had two babies, married a rock star, launched a lifestyle blog oh and done a bit of acting along the way. So, what's her secret to looking so fabulous? Well, yes a direct line to fitness supremo Tracey Anderson does help, but we're guessing she doesn't pig out on a giant chocolate button cake and hit the town for a night out on the lash every birthday.
And how will Gwyneth be celebrating her big day? Well, we know she's partial to the odd Dirty Martini and bowl of French Fries (it's true she gooped it). But we're guessing she'll be hitting the gym and toasting her bog 4-0 with a glass of her favourite antioxidant tipple Dr Perricone Super Berry Powder with Acai £49 (at perriconemd.co.uk). And if that's how she stays looking so glowy and fresh, we'll be joining her cheers!
