Her outfit, made up of pretty pastel and polka dots, looked worlds away from her usual tomboy style.
The stylish model-turned-pretty much-everything wore a baby pink, vinyl midi skirt from Marc by Marc's autumn/winter '14 collection, with a loose-fitting polka dot blouse and black lace-up heels.
The 30-year-old was clearly pleased with her new look as she took to Instagram before the show to post a picture of herself strutting along a New York Street in the outfit.
Alexa's outfit comes with a hefty price tag, though. The skirt alone costs £400! But fear not, we've recreated the look using high street pieces so you can channel your inner 'it' girl without breaking the bank.
We love this cotton blouse from H&M. The polka dots are actually little hearts - so cute! And it's only £14.99.
Team it with a PVC skirt, £20, and some faux leather lace-up heels, £28, both from shelikes.com. They're just like Alexa's but a fraction of the price.
Et voila, there you have it - Miss Chung's New York fashion week look on a budget. Now all we need is a private jet to New York!
By Megan Sutton
What do you think of Alexa's new style? Tell us below as the best comment from across the site each week wins £50!
Reveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!