After One Direction's Madison Square Garden concert Monday night, Harry, Niall Horan, Zayn Malik, Liam Payne and Louis Tomlinson hit up New York City's Hudson Hotel with the "I Knew You Were Trouble" singer for some late-night fun.
Taylor herself had just come from a gala where she was honored by—awkward alert?—ex Conor Kennedy's family.
In a series of blurry pictures, Harry, 18, and Taylor, 22, can be seen holding hands as they showed off their vocal skills.
"Haylor is real, y'all," a 1D fan tweeted along with the picture.
A One Direction fan account on Twitter captured Taylor and the guys paying homage to another boy band: the Backstreet Boys! In one shot, Taylor, Harry and Niall appear to be quite invested in a karaoke performance of BSB's 1998 hit "I Want It That Way."
Later on, shortly after 4 a.m., Harry and Taylor, holding hands again, were spotted going back to the Red singer's hotel.
On Sunday, Taylor and Harry spent the day together in Central Park. They were joined by Harry's stylist, Lou Teasdale; her fiancé, Tom Atkin; and their adorable 1-year-old daughter, Lux. Although Taylor and Harry have yet to officially confirm their relationship status, they sure looked couple-y to us on their back-to-back dates.
Live while you're young, kids!