Justin Bieber and Hailey Baldwin spotted in ‘passionate make-out session’

On-again couple Justin Bieber and Hailey Baldwin were spotted on Sunday kissing in Brooklyn, and then later making sundaes in Sag Harbor.

The young lovers were seen smooching in a Brooklyn park last month, and they were back at it again on Sunday.

Sources said they had lunch at the Soho House’s new Brooklyn outpost, DUMBO House, before taking a romantic stroll for a “passionate make-out session.” The singer and the model “did not notice strangers walking by and giving them glances; they were only focused on each other.”

Afterward, the couple walked hand in hand to a waiting SUV.

Meanwhile, spies in Sag Harbor said that the couple was also out east on Sunday — at fro-yo favorite BuddhaBerry.

Said one fan who posed with Bieber: “I don’t even post s - - t like this but it’s JUSTIN BIEBER . . . so I had to for my middle school self.” Another customer posted a pic with Bieber, who was wearing a backward ball cap and Hawaiian shirt.

In 2015, even Rihanna was turned away from the spot after it closed, despite trying some seductive moves and “caressing the front door with her body.”