The Essex duo oozed glamour as they struck a pose in a whole host of lavish gowns, with 17-year-old Lydia proving to be an absolute pro in front of the camera.
Lydia is currently studying A-Levels in English, Media Studies and Sociology, but she took a little time out to follow in her sister's modelling footsteps.
Meanwhile, after quitting TOWIE Lucy is keeping herself busy with her fitness business, Results With Lucy, and recently opened her second Lucy's Boutique store in Southend, Essex.
Not only that, the brunette beauty has been announced as the face of Italian fitness giant Ellesse and the body of fake tan brand Sunkissed.
She's also the hair of Easilocks extensions and the nails of at-home manicure brand, Gel Perfect.
Impressive CV, right?!
Following the photoshoot, Lucy said: "It was amazing to be able to work with Lydia for this collection. We had so much fun modelling and shooting each look, and she looked amazing in every one."
Lydia added: "Modelling the campaign was great fun. People joke we are like the Kardashians because there are five sisters! Modelling this with Lucy made it feel like we are! The collection has exactly what girls getting ready for their prom need. It has a look for every girl, and that's what I love about it."
Fancy getting your hands on one of Lucy's fabulous frocks? We don't blame you!
Reveal readers can get 10% off at lucysboutique.co.uk by entering the code REV10 at the check-out. Offer closes midnight on Tuesday 18 March 2014.
Lucy's Prom Dress Collection is available to buy now from lucysboutique.co.uk, and appointments are available in store by calling 01277 231277.
What do you think of Lucy and Lydia's photoshoot? Let us know by commenting below as the best comment across the site each week wins £50!
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