It's all still fresh. Our sources tell us they've only been seeing each other for a little over a month -- though that's a lot in Bieber's world. We're told they were introduced by pastor Carl Lentz. They both attend his church.
Last month, JB dropped a giant clue things were heating up between them when he was photographed mid-FaceTime with the "Pitch Perfect 2" star.
Justin's in NYC now and we're told they met up after Hailee went to the Met Gala ... solo.