Styles, 18, was seen leaving the hotel holding onto the shirt he had worn on their date the night prior and his iPhone charger.
It could well be proof positive that this is the latest Hollywood hook-up after weeks of rumors that the two pop sensations were dating.
As Celebuzz previously reported, photos showed the couple singing karaoke and, later, holding hands as they snuck into Swift’s New York hotel after 4 AM.
The late-night went down on Monday after Styles and his One Direction bandmates performed a sold out show at Madison Square Garden.
According to multiple reports, Swift and Styles sang “Don’t Go Breaking My Heart” together at karaoke before they were joined on stage by One Direction to sing the Backstreet Boys’ hit “I Want It That Way.”