Gwyneth Paltrow poses completely nude to celebrate her 50th birthday

Gwyneth Paltrow has celebrated her 50th birthday by posing in the nude in new photographs.

The Goop founder shared pictures of her in her birthday suit, painted completely gold to mark her special day on Tuesday, 27 September.

“All I know is that they’re painting me gold and that I have to be naked,” the mum-of-two said in a Goop blog post.

“I feel so good turning 50, and this is about expressing that sense of energy and optimism that I’m experiencing,” she continued.

“It’s more about the female gaze and just a sense of fun.”

Gwyneth shared all the details of her golden transformation and it's actually more complicated than it looks.

While some people may think she simply poured a can of gold paint on her naked body, the Sliding Doors star did a bunch of hair and skin treatments using her Goop products for her milestone birthday shoot.

She used GOOPGENES All-in-One-Nourishing Face Cream, GOOPGENES Nourishing Repair Body Butter, GOOPGENES Clean Nourishing Lip Balm plus G.Tox Himalayan Salt Scalp Scrub Shampoo.

Gwyneth also took the time to reflect as she noted the ‘new territory’ she was moving into.

The actress said doing so ‘requires owning my mistakes and finds me prostrate, praying I have learned from them all.’

“Accomplishments (or things I did), though known and quantifiable, feel part of this linear past, less relevant. My errors, which live in the shadows, slippery and dark, are harder to define," she added.

"Not because I don't know what they are, but because we keep them hidden, out of the logbooks,” she said in a long blog post on turning 50.

The consciously uncoupling creator mused: “I have hurt people, never intentionally, but I have done so just the same. I have let people down by not being who they needed me to be. I have betrayed myself to keep the peace.

"I have crossed lines, the thoughts of which sometimes rip me from sleep and suspend me into the hollowness of shame for a long, dark night.

"Most regretfully, and so often, I have not spoken my truth to spare some perceived consequence, that hurting someone will tear us both apart.”

Earlier this month, Gwyneth's fans were left in shock after the former Glee actress shared rare photos with her children: 18-year-old Apple Martin and her younger brother Moses Martin, 16, who she shares with Coldplay frontman Chris Martin, 45.

People couldn't believe just how much the teens resembles their famous mum and lots of Gwyneth’s 8.1 million Instagram followers commented how pleased they were to see the Hollywood star with her children.

Happy birthday Gwyneth!