Elizabeth Hurley, 55, strips to her bikini bottoms after posing naked for Instagram challenge

LIZ Hurley has stripped naked for the latest Instagram challenge before treating fans to sizzling bikini snap.

The 55-year-old stunned fans with a 60s inspired black and white pic which showed her leaning forward and letting her straight hair cascade over her shoulder and cover her breasts.

Liz is looking up sultrily through her Twiggy-esque mascara in the glamorous shot.

She captioned the photo: "It’s the season of silly challenges, but this is a sweet one. Challenge accepted."

The black and white pic was part of the new campaign #womensupportingwomen, which started in Turkey as a way to empower women and raise awareness of the high rates of femicide in the country.

Celebrities across the world have joined the campaign, including Maisie Smith, Victoria Beckham and Reese Witherspoon.

Liz's fans loved her vintage inspired look in the photo and rushed to compliment her.

One wrote: "Omg baby doll."

Another added: "Gorgeous ❤️."

While a third simply said: "WOW😍."

The actress and model then posted another stunning pic where she posed topless, wearing nothing but an open beach robe and yellow bikini bottoms.

Liz kept her hands on her hips and smiled happily into the camera as she showed off her toned body.

The mum-of-one is known for posting summery pics of her in gorgeous bikins to promote her Elizabeth Hurley swimwear brand.

It has not been all sunshine and smiles for Liz whose life was rocked last month when she learned her ex-boyfriend Steve Bing had died by suicide.

He was found outside a luxury apartment building in Century City, California at 1pm on Monday, June 22.

Liz dated the 55-year-old back in 2001 and they shared 18-year-old son Damian.

"I am saddened beyond belief that my ex Steve is no longer with us," she wrote.

"It is a terrible end. Our time together was very happy and I’m posting these pictures because although we went through some tough times, it’s the good, wonderful memories of a sweet, kind man that matter."

Despite their acrimonious split, which included Steve denying he was Damian's father, Liz revealed the pair had mended their relationship recently.

She continued: "In the past year we had become close again. We last spoke on our son’s 18th birthday. This is devastating news and I thank everyone for their lovely messages."

Their son Damian also thanked their fans for sending messages of support.

"I’d like to thank you all again for your overwhelming kindness over the past few days. Your love and support has helped me greatly during this challenging time".

His words were posted alongside a picture of himself standing in front of a large vase of white flowers.

Speaking a day after his death, Damian admitted it was a "very strange and confusing time".

Posting alongside a sunset snap, he said on social media: "Thank you from the bottom of my heart to everyone that has reached out following the devastating news.

"I’m trying to reply to as many of you as I can, but please know I will always remember your kindness.

"This is a very strange and confusing time and I’m immensely grateful to be surrounded by my phenomenal family and friends".

Steve was best known as an investor in films including The Polar Express and Beowulf, and he was also credited as a producer in Sylvester Stallone remake Get Carter.

The producer dated the likes of Sharon Stone, tennis player Lisa Bonder, Liv Tyler, Sheryl Crow, Nicole Kidman and Farrah Fawcett.

Steve is also survived by daughter Kira Bonder, who he had with former pro tennis star.