Taylor Swift's Instagram post urging her followers to register to vote led more than 400,000 visitors to the vote.gov website in less than 24 hours.
The 34-year-old pop star shared a custom URL on her Instagram Stories shortly after endorsing Kamala Harris for the upcoming presidential election in November.
According to a statement which was shared with Variety, the General Services Administration, which manages the vote.gov site, confirmed that 405,999 visitors were directed to the site through the link Swift posted.
In the week leading up to Swift’s post, the vote.gov website had averaged about 30,000 visitors per day.
While it's unclear how many of those visitors ultimately registered to vote, the General Services Administration reported over 27,000 new voter registrations on September 11.
Additionally, more than 80,000 people used the site to verify their registration status.
The new comes days after Swift endorsed Harris for president after the Democratic nominee faced Donald Trump in a fiery debate that focused on abortion rights and immigration.
The US pop megastar said she had been prompted to publicly declare her political allegiances after being made aware of a slew of AI-generated images that falsely depicted her and her fans endorsing Trump’s campaign for president.
In an Instagram post on Tuesday, the singer wrote: “Recently I was made aware that AI of ‘me’ falsely endorsing Donald Trump’s presidential run was posted to his site.
“It really conjured up my fears around AI, and the dangers of spreading misinformation. It brought me to the conclusion that I need to be very transparent about my actual plans for this election as a voter.
“The simplest way to combat misinformation is with the truth. I will be casting my vote for Kamala Harris and Tim Walz in the 2024 Presidential Election.
"I will be casting my vote for Kamala Harris and Tim Walz in the 2024 Presidential Election.”
Swift described Harris as a "gifted leader". She also complimented Harris’ running mate Walz by saying the Minnesota Governor had been "been standing up for LGBTQ+ rights, IVF, and a woman's right to her own body for decades".
"I believe we can accomplish so much more in this country if we are led by calm and not chaos," she added.
The post was signed off "Childless Cat Lady" and accompanied by a photo of her with a cat - a reference to remarks made by Trump's vice-presidential candidate JD Vance.
In a resurfaced clip from 2021, the Ohio Republican senator described several prominent Democrats - including Harris - as "a bunch of childless cat ladies who are miserable at their own lives".
This is the first time Swift has publicly declared who she will vote for in the 2024 US presidential election.
But she was a prominent critic of Trump during his time in office and his handling of the nationwide protests following the murder of George Floyd by a police officer.
In 2020 she announced her support for President Joe Biden and Harris as his vice-president a month before the election.