A New York model says he was left with a broken jaw and missing teeth during a brutal robbery outside a swanky Manhattan lounge — and is now planning to sue the night spot, arguing its security did nothing to stop the attack, The Post has learned.

Adam Byrd, 33, had just left the East Village’s Little Sister Lounge with a pal on March 16 when a group of men punched, kicked and beat him with a belt before snatching a $35,000 necklace off his neck, Byrd and police said.