Melissa Leong turns heads for all the wrong reasons in shocking dress as she attends Derby Day at Flemington Racecourse

Melissa Leong had people doing a double take on Saturday when she showcased her very unique sense of style at Derby Day at Flemington Racecourse in Melbourne.

The former MasterChef Australia star, 42, didn't quite hit the mark in a shimmering black and white striped dress featuring a thigh high split.

The reality TV star's gown also featured a flowing train but her unique choice ensured she turned heads for all the wrongs.

She completed her look with a matching headpiece, white pumps and accessorised with a silver clutch.

The presenter continued the striking metallic theme with a silver bracelet and shimmering earrings.

Melissa wore her jet-black hair in a stylish bob and exuded confidence and style as she posed under the Lexus marquee at the star-studded event.

The upbeat food critic exuded confidence and style as she rocked her best angles in the frock.

Elsewhere at the event, Rebecca Judd and Nadia Bartel stole the show as they led the celebrity arrivals at Derby Day.

The Queen of WAGs stunned in a strapless white gown which hugged her torso and showed off her assets.

She looked a classic beauty in her large hat, with the 41-year-old clutching a tiny white designer handbag as she flaunted the cape draping from her sleeves. 

The mother-of-four, who is married to retired AFL star Chris, showed off her massive wedding ring as she elevated her look with a pair of chunky gold earrings.

She opted for her usual natural makeup look, slicking on a smoky eye and nude lip, while tucking her long tresses behind her ears.

Meanwhile, friend Nadia, 39, who is the ex-wife to AFL star Jimmy, matched her dear friend in an angelic ensemble which featured a plunging neckline.

The Henne co-founder donned a more conservative sleeve with her shoulders completely covered by a tall collar.

While Derby Day may be the strictest of all dress codes, it's far from the only event during the spring racing carnival with a theme.

Melbourne Cup is all about bright colours and patterns while Oaks Day, also known as Ladies' Day, encourages women to wear 'all things feminine'. 

The final day of the week, Stakes Day, is far more relaxed, and while some rules are in place, it's nothing compared with the kick-off event of the season.

The Melbourne Cup, the race that stops a nation, has developed a reputation as one of the most fashionable of the year.