People reports several other stars were at the studio too, including Kendrick Lamar, Florence Welch and A-list couple Margaret Qualley and Jack Antonoff.
Fans also told the magazine they spied lovebirds Channing Tatum and Zoë Kravitz at the studio, as well as Maggie Rogers and Gracie Abrams.
Healy has been showing his support for Swift in recent week, attending all six of her most recent Eras tour shows.
He even joined opening act Phoebe Bridgers onstage at a Nashville show, and mingled with Taylor’s father Scott in a private box at her Philadelphia performance on Friday.
Just a few days ago, Taylor and Matty were spotted holding hands at members-only venue Casa Cipriani in NYC.
A fan snapped the photo, which shows Taylor and Matty heading inside with Swift’s frequent collaborator Jack Antonoff in the foreground.
The sightings come after The Sun reported earlier this month that Taylor, 33, and Matty, 34, are “madly in love.”
An insider told the paper, “They are both massively proud and excited about this relationship and, unlike Taylor’s last one — which was very much kept out of the spotlight, deliberately — she wants to ‘own’ this romance, and not hide it away. Taylor just wants to live her life, and be happy.
“Extra” reported in April that Taylor Joe Alwyn called it quits after six years of dating. According to The Sun’s source, Taylor and Joe broke up back in February, “so there was absolutely no crossover.”
Fans may recall that back in January, Taylor made a surprise appearance on the first night of The 1975’s At Their Very Best tour.