One of those lucky fans was Kendall Rivera, who shared the selfie she and her pals snapped with the lovebirds with ET. She tells us Bieber and Baldwin were "so nice," and "immediately wanted to have a conversation."
"They asked us how our Sunday was going, then I asked them if they had ever been here," she recalls. "Hailey said she had and that she likes to get the chicken. We then asked if we could take a selfie with them and they were super cool about it and very down!"
"Then, as they were leaving, they passed by our table and said, 'Hope you guys have a great rest of your day,'" she continues. "Overall, they were really, really nice!"
Bieber and Baldwin -- who a source says are "casually dating" after kindling their romance in recent weeks -- seem to be having a blast in the Big Apple. Over the weekend, they were also spotted making out in a garden in Brooklyn, seemingly paying no mind to the paparazzi who caught them mid-lip lock.