Broadcasting watchdog Ofcom received 235 complaints about the navy gown with a plunging neckline and thigh-high split that the 49-year-old judge wore during the latest semi-final round of the ITV talent show on Saturday night.
Holden scoffed on her Instagram stories: “Mmmm really?! Who has nipples this close to their cleavage?!
“FYI. A boned corset dented the girls all night.”
She added two fried egg emojis.
Watch: Amanda Holden sends dancers through to BGT final
The dance has led to thousands of complaints being made to the broadcasting watchdog and torrents of racial insults hurled at the groups members on social media.
Diversity’s dance performance was inspired by the death of George Floyd and included a moment when lead dancer Ashley Banjo lay beneath a figure in police uniform who placed his knee on Banjo’s neck.
A week later fellow judge Alesha Dixon wore a gold necklace on the show featuring the letters B, L and M to stand for Black Lives Matter.
This sparked over 1,675 complaints to Ofcom.
ITV has issued a statement in support of Diversity, saying: “Britain's Got Talent has always been an inclusive show, which showcases diversity and supports strong storytelling in all forms and ITV stands behind the decision to broadcast Diversity's performance on BGT.
"Ashley [Banjo] and the group are a great example of the talent, creativity and diversity of modern Britain and their performance was an authentic, heartfelt response to many of the issues and events which have affected society in 2020."
George Floyd aged 46 after a white Minneapolis police officer was seen pinning him to the ground by kneeling on his neck as he pleaded for air.
Following Floyd’s death, anti-racism protests were held around the world.
Diversity found fame after winning the third series of Britain’s Got Talent in 2009. Other members include Ashley’s brother Jordan and Perri Kiely.
Watch: Viewers flood to Ofcom to complain about Gogglebox