The Instagram post showed her holding her cat Benjamin Button - a reference to Mr Trump's running mate JD Vance's "childless cat lady" comments.

Swift urged her 283 million followers to "do your research," but said AI-generated images of her supporting Mr Trump made her realise "I need to be very transparent about my actual plans".

Follow the latest on the Trump v Harris debate reaction here

"I will be casting my vote for Kamala Harris and Tim Walz in the 2024 Presidential Election," she said. "I'm voting for Kamala Harris because she fights for the rights and causes I believe need a warrior to champion them.

"I think she is a steady-handed, gifted leader and I believe we can accomplish so much more in this country if we are led by calm and not chaos.

"I was so heartened and impressed by her selection of running mate Tim Walz, who has been standing up for LGBTQ+ rights, IVF, and a woman's right to her own body for decades."

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Soon afterwards, the Harris campaign celebrated the endorsement on X by showcasing Harris-Walz friendship bracelets.

Referencing the lyrics of Swift's hit ...Ready For It? - her team posted an image of the bracelets, which can be purchased on the campaign's official site, saying: "Are you ready for it? Harris-Walz friendship bracelets have hit the store!"

Friendship bracelets have become synonymous with Swift and her sold-out Eras tour with fans exchanging them with one another.

'Massive star' endorsement could be 'huge'

Sky News US correspondent James Matthews said after her post that Swift's endorsement is "huge" for the Harris-Walz campaign.

"She is a massive star, huge," he said. "She speaks to people in a way that politicians do not, and the message from Taylor Swift will resonate with a huge audience far beyond the kind of people watching what has gone on here.

"The timing will not have been an accident. Tonight, the headline is Taylor Swift. Tomorrow, all the talk is going to be about Kamala Harris and Taylor Swift and the momentum that will be behind her."

It marks the first time Swift has spoken on the 2024 election. While the Style hitmaker did endorse Joe Biden in 2020, she did so only a month before election day.

However, despite her worldwide fame and popularity even Taylor Swift cannot escape the vicissitudes of American politics. The number of people following her on social media fell following her post.