Bella Hadid Shows Off Major Underboob in NYC

Bella Hadid's lunch runs are more fun than yours ... probably a lot sexier, too.

The supermodel was grabbing food to-go with friends in NYC Saturday when her boob nearly fell out the bottom of her crop top. It's hot in the city, so Bella's tiny shirt makes sense ... though her underboob appears to just be a happy accident.

Either way, Bella laughed it off and fixed the wardrobe malfunction on the run.