The sisters showed off strikingly different yet equally glam looks as they mingled with the likes of Danielle Peazer and Ashley James at the event, which was held at The Belgraves Hotel in Chelsea.
Older sister Lucy ditched the designer threads in favour of a loose-fitting jumpsuit by high street fave H&M, which featured a plunging neckline and a monochrome dotty print, along with a tie belt to cinch in her waist.
If you fancy snapping it up for yourself, it's available to buy for a purse-friendly £39.99. Win!
The pretty brunette added length to her pins with pointed patent courts, accessorising with a long delicate gold necklace while sweeping her locks into a loose chignon.
She showcased her low maintenance side by keeping her nails bare, finishing with smoky brown eyeshadow and oodles of lash-plumping mascara, plus a slick of petal pink gloss on her lips.
Meanwhile, sister Tiffany - who made her Made In Chelsea debut last year - amped the glitz factor up a notch, turning heads in a shimmering frock covered in gold sequins with the number 10 written across the front.
We actually spotted Lauren Platt sporting the same dress on The X Factor 2014 - it can be hired for £29 from GirlMeetsDress.com.
Tiffany warded off the chills with black opaque tights and flat ankle boots, toting her evening essentials in a quilted clutch while styling her sandy tresses in a bouncy, voluminous blow-dry.
Looking lovely, ladies!
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