She undoubtedly turned heads at an exclusive Melbourne Cup celebration event hosted by Lexus in Sydney on Wednesday.
But according to rules made by race organisers, Delta Goodrem's outfit choice was a rebellious one - as anything with a cut-out detail is now deemed 'unacceptable' in a dress code crackdown.
Two weeks after the Australian Turf Club (ATC) revealed 'cut-out' dresses were banned, the Victorian Race Club (VRC) issued the same guidelines - meaning Delta's slinky ensemble wasn't acceptable for the event.
Rebel: According to rules made by race organisers, Delta Goodrem's outfit choice to the Melbourne Cup media event in Sydney on Wednesday was a rebellious one - as anything with a cut-out detail is now deemed 'unacceptable' in a dress code crackdown
Although Wednesday's affair wasn't strictly in Melbourne - and didn't involve any actual racing - it was still technically an event to celebrate the Melbourne Cup.
However, Delta clearly didn't get the memo about the strict fashion rules, opting for the slinky, flowing sage green dress for the shindig held in The Rocks.
Despite the rule-break, she of course looked radiant in the pretty frock which featured a high neckline, puffy shoulders and peplum waist with cut-out detailing on the hips.
Pretty in pastels: Despite the rule-break, she of course looked radiant in the pretty frock which featured a high neckline, puffy shoulders and peplum waist with cut-out detailing on the hips
Glamorous: The Born to Try star wore her hair in a low ponytail and her makeup comprised fluttery lashes, peachy cheeks and a nude pout
She turned to the side to reveal the cheeky backless element of her outfit, and accessorised with a pink boater-style hat, red statement earrings, a designer purse and lilac heels.
While Delta enjoyed the event today, the club's members enclosure warned this week that it will be 'strictly enforcing' regulations throughout the Melbourne Cup carnival, which kicks off Saturday October 30 and ends on November 6.
Other garments that are banned include jeans, shorts, leggings and bulky jackets.
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