She is at war with Andy Cohen.

And Kathy Griffin said during a YouTube video she uploaded on Friday that the Bravo executive and host allegedly offered her cocaine.

The 56-year-old said while on Watch What Happens live 'right before we went live, Andy Cohen privately asked me in an office in embassy row, which is the production company that does that s***show asked her if I wanted to do blow,' she claimed.

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Strong allegation: Kathy Griffin said during a YouTube video she uploaded on Friday that the Bravo executive and host allegedly offered her cocaine

Kathy alleges that he asked her both times she visited the show.

'He was asking me to do cocaine with him,' she added.

Kathy said: 'I get it I know the haters are going to say if you can't take it, don't dish it out but I'm a comic so if Oprah wants to come for me I kind of deserve it, Ryan Seacrest, all right I have it coming, but Andy Cohen I didn't call you. You shouldn't have come for me.'

She then called him a 'miserable boss' for all those years as her boss on her show My Life On The D-List.

War of words: The 56-year-old said while on Watch What Happens live 'right before we went live, Andy Cohen privately asked me in an office in embassy row, which is the production company that does that s***show asked her if I wanted to do blow,' she claimed

Kathy also alleged that he harassed her and treated her 'poorly.'

The comedian also directed her attention to TMZ for posting a video of Andy pretending to not know who she is.

Kathy shared TMZ founder Harry Levin's phone number as well as his message asking her to call him back.

The star said during the two month investigation following the controversial photo of Donald Trump, 'phone numbers got out of my mom and my mom got death threats at her retirement village and my sister while she was dying of cancer got death threats at her apartment.'

Not holding back: She then called him a 'miserable boss' for all those years as her boss on her show My Life On The D-List

After publishing the 17-minute long video, Andy took to Twitter to deny the allegation.

He wrote: 'I am completely stunned by this story. It is 100% false and totally made up.'

BuzzFeed contacted Bravo for comment and the network's spokesperson said: 'This is completely false and we are not going to credit it with any more attention.'

Not staying quiet: After publishing the 17-minute long video, Andy took to Twitter to deny the allegation

Putting it all out there: The comedian also directed her attention to TMZ for posting a video of Andy pretending to not know who she is

'Who?' Andy Cohen pretended not to know Kathy Griffin after replacing her as CNN's New Year's Eve host... but she angrily brands him 'misogynistic'; he is seen last week

Andy was executive producer of her six-season reality show Kathy Griffin: My Life on the D List which aired on Bravo from 2005-2010.

He joked on Thursday that he had never heard of Kathy Griffin, after replacing the sacked star as Anderson Cooper's co-host onCNN's New Year's Eve coverage.

Comic Kathy saw the video and was not happy - responding on Twitter: 'Even when it's on tape, there are doubters? He is NOT kidding w paps.

'Was my boss for 10 years. Treated me like a dog. Deeply misogynistic.'

Kathy shared this tweet Friday morning after seeing the Cohen video

The comments which sparked the 56-year-old's fury were made during an impromptu sidewalk interview with a cameraman from TMZ, who caught him on Thursday after he landed at LAX.

Watch what Happens Live host Cohen first said he was 'really psyched' about his new gig.

But when asked if he had spoken to Kathy, Cohen made it clear he had no intention of doing so, joking around as he said 'Who?' and insisted he 'didn't know' her.

Ditched: Kathy was fired as the co-host of CNN's NYE coverage earlier this year; she is seen on last year's show with Anderson Cooper

Griffin and Cooper had co-hosted CNN's NYE coverage every year since 2009.

Now in its 11th year, CNN's New Year's Eve show is a global celebration featuring contributions from CNN correspondents across the country and around the world.

However Griffin was ditched by CNN in May after posting a skit online showing herself holding a model of Donald Trump's bloody severed head.

The controversy following the video also saw her tour cancelled, despite Griffin making a tearful public apology to the President.

Cooper himself tweeted his disdain for Griffin's actions at the time.

'For the record, I am appalled by the photo shoot Kathy Griffin took part in. It is clearly disgusting and completely inappropriate,' he wrote in tweet.

Griffin then said in an interview that any friendship between the two was 'over'.

Cooper's best friend Cohen was tapped as his replacement.