Cher compared Donald Trump to Hitler and slammed him for being a 'f***ing idiot' as she unleashed a barrage of insults during a Hillary campaign event.

The legendary entertainer and long-time Clinton supporter also said the GOP candidate reminded her of the actress who played a murdering child in the 1970s film, 'The Bad Seed.'

Speaking Sunday in Provincetown, Massachusetts, the singer and actress gave a stinging — and at times profane — assessment of the Republican presidential nominee.

Cher compared Donald Trump to Hitler and slammed him for being a 'f***ing idiot' as she unleashed a barrage of insults during a Hillary campaign event in Provincetown, Massachusetts, on Sunday

The legendary entertainer and long-time Clinton supporter also said the GOP candidate reminded her of the actress who played a murdering child in the 1970s film, 'The Bad Seed'

Invoking 'The Bad Seed' she said: 'He's so Patty McCormack, consummate liar, doesn't care who she hurts, insane.'

Before an enthusiastic crowd, Cher also said of Trump: 'Do you remember 'Fun with Dick and Jane'? It's like racist fun with Dick and Jane.'

She later added: 'He doesn't mean we want to make America great again. He means we want to make America straight and white.' She also said that she was reminded of 'despots, you know Stalin and Hitler.'

A video of Cher's remarks at the 'LGBT summer celebration' was posted on Facebook and first reported by The New York Times.

Cher and Hillary, who have worked together on past political campaigns, pose together at another fundraiser in 2000

People dressed as Cher hold signs supporting Democratic Hillary Clinton near the entrance of Pilgrim Monument and Provincetown Museum in Provincetown, Massachusetts

Cher, who has been campaigning with Clinton, offered praise, though with a few caveats.

'She is shy and she's not the greatest speaker in the world,' Cher said. 'But this is what I believe and this is what I know. I know she will work every moment of every day.'

After the event, Cher told reporters that Trump was 'a racist, he's a misogynist, he's a horrible person.'

A partial clip of Clinton's remarks was also posted on Facebook. Thanking Cher, Clinton said: 'I can't tell you how excited I am to have Cher here.'

A popular entertainer for decades, Cher came to fame in the 1960s as part of a singing duo with then-husband Sonny Bono.

She has enjoyed success as a solo artist, with songs like 'If I Could Turn Back Time' and 'Believe,' and has starred in movies, including 'Moonstruck,' ''Silkwood' and 'Mermaids.'

Hillary partied at a star-studded fund-raiser at the home of Justin Timberlake (left) and Jessica Biel (right) in Los Angeles on Monday evening