Earlier on the week, we showed you pictures of the two sudden lovebirds holding hands in Central Park.
They must've really enjoyed one another's company, because yesterday morning, Sir Heartthrob Harry, 18, was seen leaving 22-year-old Taylor's NYC hotel with an overnight bag!
The lead singer of the world's biggest boy band had on the same pants and shoes as the night before, but he did manage to change his shirt.
Taylor left separately from her new beau and headed to Cookshop for lunch!
What do you think went down during the intimate sleepover? We can guess...