Mia Farrow, Jameela Jamil and Davina McCall are among the stars who criticised the minute-long advert for 60 Minutes Australia – with some accusing the programme of being racist.
The promo claimed it will show how “Meghan Markle lost her sparkle – from adored to insufferable in less than a year”.
Soundbites from a series of supposed “experts” also appear – including controversial columnist Katie Hopkins and TV personality Lizzie Cundy.
In the clip, Hopkins calls Meghan “a no one” before attacking the royal’s “bad clothes”.
The former reality TV star then accused the Duchess of Sussex of being a hypocrite because she uses private jets despite being vocal about climate change.
Hopkins, who once called African migrants “cockroaches”, has aligned herself with various far-right media outlets since moving on from roles at The Sun, the Mail Online and LBC.
Cundy described Meghan as “manipulating”, claiming the former actress simply wanted to date a celebrity.
Another interviewee called her “a fiend, a monster and a hypocrite”.
The couple wed in 2018, welcoming their first child a year later
American actress Mia Farrow tweeted: “Shame on you for airing this trash. – Great Britain is fortunate to have this intelligent, compassionate, beautiful woman in the Royal Family. In her, Prince Harry has found happiness and for that we rejoice.”
In a follow up message, Farrow wrote: “With all due respect- this smug racist babble is appalling, idiotic, distressing and disgusting.”
The Good Place star Jameela Jamil wrote: “You stupid, anti-black, scum bags. This is a f***ing pantomime, not journalism.”
Her reference to Prince Andrew refers to the recent publicity around his relationship with disgraced financier Jeffrey Epstein.
Jamil was recently hand-picked by the duchess to appear on the cover of Vogue’s coveted September issue.
Presenter Davina McCall tweeted: “Are you guys for real? This is pathetic journalism … and smacks of racism”.
The advert goes on to ask “what went wrong for Meghan, and how it affects hubby Harry” – and suggests “the ghost of Princess Diana” may be about to save the couple’s “fairytale future”.
The post has received more than 11,000 comments, many criticising the documentary for its bullying tone.
It is going to be broadcast on Sunday evening.
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