'I think he's a genius!' Darren Day reveals his awkward encounter with Isla Fisher and her husband Sacha Baron Cohen as he discusses his famous exes in CBB house

He's as well known for his headline-grabbing personal life as his acting career.

And Darren Day didn't hold back when it came to filling his Celebrity Big Brother housemates in on his famous exes and battle with booze during his first night on the Channel 5 reality show.

On Wednesday's episode viewers saw the ex soap star reveal his awkward run-in with his ex girlfriend Isla Fisher and her husband Sacha Baron Cohen.

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Tales from his past: Darren Day entertained his Celebrity Big Brother housemates, including John Partridge, on the first night in the house as he revealed all about his headline-hitting past

Tales from his past: Darren Day entertained his Celebrity Big Brother housemates, including John Partridge, on the first night in the house as he revealed all about his headline-hitting past

Darren had a difficult first night in the house after volunteering to live in the box room with EastEnders star John Partridge as part of Big Brother's first twist.

During Wednesday's episode, fans saw Danniella Westbrook join the two, sacrificing her place in the main house so the remaining housemates could have their beds unlocked.

Despite their less than comfy surroundings, the trio soon bonded as they shared stories from their past.

See the latest news and updates from the 2016 CBB house with more on Darren Day

Famous ex: The ex soap star told his CBB housemates that he ran into his ex Isla Fisher, who he dated for two years from 1998, at a wedding

Famous ex: The ex soap star told his CBB housemates that he ran into his ex Isla Fisher, who he dated for two years from 1998, at a wedding

Darren told his housemates that he ran into 'four or five' exes at a wedding, who were all their with their partners.

The star went onto say that it was his encounter with Isla, who he dated for two years from 1998, that proved to be the most awkward as he's a huge fan of her now-husband Sacha, as he thinks the Borat star is 'a genius.' 

'So when I bumped into her, there was the awkwardness of bumping into an ex you've not seen for a few years and meeting the new partner, but I also wanted to say 'Listen mate, I think you're bloody amazing.' It was great to meet him,' Darren said. 

Awkward: Darren told his housemates that he ran into 'four or five' exes at a wedding, who were all their with their partners

Awkward: Darren told his housemates that he ran into 'four or five' exes at a wedding, who were all their with their partners

Good to meet you! The actor revealed that  he's a huge fan of Isla's now-husband Sacha Baron Cohen, as he thinks the Borat star is 'a genius.'

Good to meet you! The actor revealed that  he's a huge fan of Isla's now-husband Sacha Baron Cohen, as he thinks the Borat star is 'a genius.'

Darren revealed before going in the house that he's still on good terms with the family of his ex fiancee Anna Friel, explaining: 'Anna's mum and dad I've kept in touch with and we've just wished each other a happy new year, so things aren't as bad as people may think.

'With all of my relationships, we had a very public get-together, relationship and break up.'

Talk also turned to both Darren and Danniella's past addictions as they whiled away the hours in the box.

While Darren revealed that his six month stint on Hollyoaks saw him briefly living a sober life, before returning to the booze, it was Danniella's revelation about her first try of cocaine that really shocked.

Good to have you: Darren and John were joined by Danniella Westbrook in the box room during the first night in the house

Good to have you: Darren and John were joined by Danniella Westbrook in the box room during the first night in the house

'I started when I was 14, the first thing I ever done was coke,' she told John and Darren.

Darren revealed that he first started taking cocaine when he was 28, and admitted he was hooked on the drug the first night.

Danniella is keen to create a fresh start with her time in the CBB house, telling her housemates, 'This is it for me, I need to clear the sh*t that I'm carrying,' adding that she thinks the most addictive thing in life is fame, and that she sees it a lot in people who are reality based and who are desperate for time in the spotlight. 

Her side: The ex EastEnders star also shared candid revelations about her battle with drugs

Her side: The ex EastEnders star also shared candid revelations about her battle with drugs

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