Kim Kardashian swapped fashion for fitness after filming a new episode of Project Runway together in New York.
The stylish pair slipped into gym gear for a jog along the water's edge in Battery Park City over the weekend.
The supermodel and mother of four, 39, later tweeted: 'We ran 4 miles today! Thanks for coming @KimKardashian.'
Air kisses: The pair say their goodbyes after stopping for refreshments at Starbucks
Keeping up with Heidi: Kim Kardashian joined Project Runway host Klum for a run in New York over the weekendThe reality TV star, 30, replied: 'Thanks for motivating me to get up early!'
Kardashian joined the fashion design show as a guest judge last week and it's clear she bonded with the German host.
The new season of the popular show is set to air in the U.S. next month.
Of course, the brunette is also gearing up for her impending nuptials.
She is set to wed NBA player Kris Humphries later this year and has vowed to 'slim down' before the big day.
She has been has been hitting regularly, some times managing multiple workouts a day.
Meanwhile, the star went out of her way to prove that her curves are all natural in teh latest episode of Keeping Up With The Kardashians.
On last night's show, she was seen getting a x-ray on her famous derrière in an effort to dispel rumours of but implants.
Glam squad: Kim joined Michael Kors, Heidi and Nina Garcia on the set of Project Runway in New York on Friday
On the x-ray of Kim, he ruled: 'No implants.'
Kim said: 'I'm so glad I did this x-ray.
'The whole world has been doubting me - this is the best thing I could've done.'