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Firm favourite: It is easy to see why EXPRESS chose Hailey Baldwin to star in their new ad campaign in New York on Wednesday

She looked in pleasingly fine form in her skimpy EXP Core Performance workout top, skintight bottoms and, of course, an expensive pair of trainers.

Hailey took great delight in showing off her ripped six-pack, no doubt the result of much hard work in the gym.

But arguably it was her delightful derriere that really stole the show after it was showcased in her spectacular spandex trousers.

Hailey is the youngest daughter of Stephen Baldwin, who is the black sheep of the family due to his support for Republican politicians.

She looks fit: The model took great delight in flaunting her ripped physique for the excited photographers

Ready for her close up: A strapping young gentlemen checked the light levels before shooting began

Ab-solutely fabulous: No doubt Hailey is a staunch advocate for crunches, planks and healthy eating

The teenager has become firm friends with fellow clotheshorse Kendall Jenner, but she was on her own for once as she worked it for all she was worth on the sidewalk.

Hailey has recently returned to the Big Apple following her trip to Mexico with BFFs Kylie and Kendall Jenner and Kylie’s boyfriend Tyga, 25.

They were spotted partying on a yacht, zip lining, and hanging out at the pool at Girls Gone Wild founder Joe Francis’ luxury beachfront home.

No doubt Joe was loving having the young ladies over for some fun in the sun at his posh pad.

 

Cheeky girl: Her EXPRESS EXP Core Performance trousers showcased her delightful derriere

An impressive sight: The fantastic support of her sports bra was plain for all to see

 

The sidewalk is her catwalk: And she was certainly giving her fellow pedestrians something to smile about