But while they chose strikingly similar dresses and both wore their brunette hair in sexy, tousled waves, the TOWIE and Made In Chelsea beauties both added their own twist to the LBD theme.
Fresh from her visit to Reveal HQ to showcase her new collection for Lipstick Boutique, Lydia changed into the skater style with long mesh sleeves, swapping her red patent stilettos for a pair of black ankle boots, but keeping her vampy red lips and immaculate red manicure - it's a good look, Lyds!
Lucy, meanwhile, went for barely-there makeup and let her dress do the talking - a cutout number that showed off her toned, tanned midriff.
New Gorgeous Couture model Lucy paired her black skater dress with strappy black platform sandals and a swanky-looking bag.
While we can't decide whose look we prefer, one thing's for sure: when you're as blessed in the looks department as these two, an LBD is all you need!
Whose look do you prefer? Let us know below - our favourite comment from across the site each week wins £50!