The braless socialite-turned-supermodel, 20, grinned as she strolled past the cameras happily showing off her taught stomach and section of boob after stepping off yet another catwalk in Milan.
Whipping her brown hair back, the American beauty seemed unbothered by the wardrobe malfunction.
The superstar, who used to date Selena Gomez’s boyfriend The Weeknd, was heading back to her H๏τel for a rest after another busy day at Milan Fashion Week.
The gorgeous younger sister of Zayn Malik’s partner Gigi has modelled for Bottega Veneta, Moschino, Alberta Ferretti and Versace this week, among others.
Bella is famous for her extremely racy red carpet looks, which usually involve dresses with insanely high splits up the leg.
So a crop top baring boob must have been a cakewalk for former Victoria’s Secret Angel Bella – though she did tug down the top to cover her boob when a draft got up there.
The New Yorker, who’s signed to IMG models, won GQ’s Model Of The Year in 2016 after a stunning physical transformation – which many attribute to extensive plastic surgery.
Recently Bella was spotted displaying her nipples in a barely-there stretchy outfit on her way to a Victoria’s Secret fitting.
And the star is obviously a fan of the colour red as for this year’s Sєxy LOVE mag advent calendar she’s been filmed wearing a scarlet undies and suspenders set – after walking for Ralph Lauren in a crimson gown.
Bella – who shouted at a security guard for man-handling a female snapper in New York this month – is currently at the top of her modelling game.
She is yet to comment on the pregnancy of close pal Kylie Jenner, 20 – who today was spotted out for the first time, sporting a “bump”, with likely baby daddy, rapper Travis Scott.
Youngest Kardashian clan member Kylie is said to be expecting a baby due in February 2018, and the shock celeb news has inspired scores of brilliant internet memes this week.