Posting on her Twitter account, publicist Tree Paine encouraged fans of the Wildest Dreams singer to not believe what had been printed about the famous couple, who have been dating for seven months.

"I've said it before and I'm saying it again, do not believe Radar Online," Paine tweeted.

On Monday, online tabloid Radar Online alleged Swift, 25, had broken up with Harris, 31, after she caught him leaving a Thai massage parlour.

The story was accompanied by 11 photographs which seemed to show Harris exiting said massage parlour.

"Taylor Swift just got some fresh material for her next album," the tabloid wrote, referencing Swift's talent for writing songs about ex-boyfriends.

Swift and Harris were first spotted together in March, attending a concert by country singer Kenny Chesney in Nashville.

They confirmed their relationship two months later at the 2015 Billboard Music Awards, where Harris was shown affectionately congratulating Swift on each of her eight wins.

Speaking to British radio station KISS FM in July, Harris described the rumours about their relationship as "interesting".

"It's interesting because obviously there's a different thing written about it every day and even if we don't do anything publicly for a while, someone will make something up," the How Deep Is Your Love DJ said.

"Whether it's that I'm allergic to cats or that we're getting married next week, you've just got to take it how it is."

Despite the rumour mill, Harris said he was "insanely happy".

Swift, whose diverse list of previous romances includes singer Nick Jonas, actor Jake Gyllenhaal​ and Conor Kennedy, a member of the famous US political family, seems to be similarly pleased with her love life.

She told Vanity Fair for its September issue that, after the release of her 1989 album, she was only going to date men who wouldn't require her to change herself or her career.

"That was the way I decided to go on with my life: Not looking for anything, not necessarily being open to anything, but only being open to the idea that, if I found someone who would never try to change me, that would be the only person I could fall in love with," she said.

"Because, you know, I was in love with my life."