PICTURE EXCLUSIVE: Embattled Mischa Barton poses for bikini shoot in Malibu... as sex tape featuring actress is being shopped at porn companies

Porn industry giants are currently bidding upwards of $500k for a sex tape reportedly featuring The OC's former leading lady.

But embattled actress Mischa Barton had her mind on work on Monday, as pictures obtained exclusively by DailyMail.com show the actress at the heart of the scandal posing for a laidback bikini photoshoot in Malibu.

While video stills said to feature the 31-year-old engaged in provocative acts are currently being shopped around to high profile companies, the gorgeous star certainly seemed to have other things on her mind.

Scandal on horizon: While a video said to feature the OC alum engaged in provocative acts is currently being shopped around to high profile porn companies
Model figure: Mischa Barton was spotted posing for a bikini photo shoot in Malibu on Monday, in pictures obtained exclusively by DailyMail.com

 Model figure: Mischa Barton was spotted posing for a bikini photo shoot in Malibu on Monday, in pictures obtained exclusively by DailyMail.com

Scandal on horizon: While a video said to feature the OC alum engaged in provocative acts is currently being shopped around to high profile porn companies

Scandal on horizon: While a video said to feature the OC alum engaged in provocative acts is currently being shopped around to high profile porn companies

Mischa even seemed positively carefree, captured sticking her middle finger up playfully at those ont he beach and smoking a cigarette seductively on-set.

The honey haired actress was confident in a white bikini, showcasing her svelte figure, and embodied the ultimate all-American girl in a Nineties' style crop top.

A one-time screen teen star, the actress was turning her hand to modelling once again for a 138 Water Commercial with fashion photographer Malachi Banales.

White hot: The honey haired actress was seen wearing a white bikini, showcasing her svelte figure

White hot: The honey haired actress was seen wearing a white bikini, showcasing her svelte figure

Co-star: It's not clear who the man in the video is and Barton has not stepped out with anyone publicly in recent months

Co-star: It's not clear who the man in the video is and Barton has not stepped out with anyone publicly in recent months

Details: In the video, Misch is 'seen performing a sex act on a guy and can be seen having sex in various positions'

Details: In the video, Misch is 'seen performing a sex act on a guy and can be seen having sex in various positions'

Model figure: Mischa Barton was spotted posing for a bikini photo shoot in Malibu on Monday, in pictures obtained exclusively by DailyMail.com

Model figure: Mischa Barton was spotted posing for a bikini photo shoot in Malibu on Monday, in pictures obtained exclusively by DailyMail.com

Earlier on Monday, DailyMail.com revealed that a sex tape said to be featuring Mischa is being passed around Hollywood.

The X-rated video, which is believed to show Barton having sex with a dark haired man, is being offered to the highest bidder with the starting price of $500,000.

The footage is being touted to online porn companies, with a number of porn industry giants considering the offer.

Flashback: Adding a touch of Nineties glamour, Mischa wore a yellow embroidered crop top as she posed seductively for the cameras

Flashback: Adding a touch of Nineties glamour, Mischa wore a yellow embroidered crop top as she posed seductively for the cameras

Distracted: The gorgeous star certainly seemed to have other things on her mind

Distracted: The gorgeous star certainly seemed to have other things on her mind

Keeping hydrated: The star was modelling once again for a 138 Water Commercial with fashion photographer Malachi Banales
Keeping hydrated: The star was modelling once again for a 138 Water Commercial with fashion photographer Malachi Banales

Keeping hydrated: The star was modelling once again for a 138 Water Commercial with fashion photographer Malachi Banales

Uh-oh: Earlier on Monday DailyMail.com revealed that a sex tape said to be featuring Mischa is being shopped around Hollywood.

Uh-oh: Earlier on Monday DailyMail.com revealed that a sex tape said to be featuring Mischa is being shopped around Hollywood.

Risque: The x-rated video, which is said to show Barton having sex with a dark haired man

Risque: The x-rated video, which is said to show Barton having sex with a dark haired man

Pricey: It is being offered to the highest bidder with the starting price of $500,000

Pricey: It is being offered to the highest bidder with the starting price of $500,000

Kevin Blatt, Hollywood’s sex-tape broker, was approached by a third party with the video.

He told DailyMail.com: 'The tape is being shopped around porn valley, the asking price is $500,000.

'I know that at least three large online porn sites, YouPorn.com, Porn.com and RedTube.com have reviewed it and they're all seriously considering the offer.

Shopping around: The footage is being touted to online porn companies

Shopping around: The footage is being touted to online porn companies

In the mix: A number of porn industry giants are considering the offer

In the mix: A number of porn industry giants are considering the offer

For sale: Kevin Blatt, Hollywood’s sex-tape broker, was approached by a third party with the video

For sale: Kevin Blatt, Hollywood’s sex-tape broker, was approached by a third party with the video

Proof: He told DailyMail.com — 'The tape is being shopped around porn valley, the asking price is $500,000

Proof: He told DailyMail.com — 'The tape is being shopped around porn valley, the asking price is $500,000

When not if: 'I know that at least three large online porn sites, YouPorn.com, Porn.com and RedTube.com have reviewed it and they're all seriously considering the offer,' Blatt said

When not if: 'I know that at least three large online porn sites, YouPorn.com, Porn.com and RedTube.com have reviewed it and they're all seriously considering the offer,' Blatt said

Counter: Mischa switched from healthy water to less healthy cigarettes for a few black and white snaps

Counter: Mischa switched from healthy water to less healthy cigarettes for a few black and white snaps

'I've seen stills from the video, it's clearly Mischa in my opinion. She's seen performing a sex act on a guy and can be seen having sex in various positions.'

It's believed the video was shot at a private residence in Hollywood within the past year. 

And, while it's not clear who the man in the video is and Barton has not stepped out with anyone publicly in recent months. 

Salute: She extended a good-natured middle finger to one of the crew at one stage

Salute: She extended a good-natured middle finger to one of the crew at one stage

Barton is said to be seen wearing a grey hoodie and nothing else having sex on a double bed with a man wearing just a black T-shirt.

The explicit footage appears to have been shot in a bedroom, the bed has a leather padded headboard and mirrored panels, while coffee cups and an empty bottle of Gatorade litter a bedside table.

Adding to the less than glamorous surroundings, there's also a flier on the table for CURRENT: LA, Los Angeles' first city-wide Public Art Biennial. 

Chilly: She donned a pair of wide legged trousers as the sun dipped

Chilly: She donned a pair of wide legged trousers as the sun dipped

Company: A dog photobombed the shoot for a moment

Company: A dog photobombed the shoot for a moment

Best side: An assistant helped refocus the dying light with a reflector

Best side: An assistant helped refocus the dying light with a reflector

Sources close to the star fear for her emotional well-being, should the video be leaked online.

One source told DailyMail.com: 'This is the last thing Mischa needs. Her name has been dragged through the mud enough times, she doesn't need a sex scandal right now.'

Barton, 31, has had a series of private meltdowns this year that included screaming in her backyard while hanging over a fence and damaging her apartment building with a U-Haul moving truck.

In February, Mischa was pictured drinking, smoking and partying until 3am just weeks after her shocking 'meltdown'.

Setting: It's believed the video was shot at a private residence in Hollywood within the past year

Setting: It's believed the video was shot at a private residence in Hollywood within the past year

Wardrobe: Barton is said to be seen wearing a grey hoodie and nothing else having sex on a double bed with a man wearing just a black t-shirt

Wardrobe: Barton is said to be seen wearing a grey hoodie and nothing else having sex on a double bed with a man wearing just a black t-shirt

The outing came shortly after two of her neighbours called 911 to seek help for the actress, who was reportedly threatening to kill herself.

'My downstairs neighbor is hysterically crying in the backyard and says she's going to kill herself,' said a female neighbor in a 911 tape obtained by TMZ

'She's screaming and she just keeps on saying "I want to die" and then she's like "I'm going to kill myself" and then she just keeps on, yeah, it's all nonsensical. But I'm very concerned.'

Barton, 31, claimed that she had been given the date rape drug GHB following the incident, which led to her being hospitalized after paramedics arrived on the scene.

In previously released footage of the meltdown, which appeared to be filmed by a neighbor, Barton could be seen ranting and raving while she hang over a fence in her backyard. 

Back in the day: She starred as Marissa Cooper in the Fox television series The O.C. for four years

Back in the day: She starred as Marissa Cooper in the Fox television series The O.C. for four years