The star seemingly went braless in the stunning dress as she smiled at the London Palladium.
Amanda stunned in the bright pink latex number, along with orange and pink stiletto heels.
She wore her golden tresses in a waved look, while styling the look with gold band jewellery and a nude nail.
She accessorised with a pair of shades, while sporting a natural makeup look featuring a peach blush and rosy lip gloss.
Later on it became clear Amanda’s look was inspired from Greases’ Pink Ladies, as she wore her own jacket.
Fellow judge Alesha Dixon also opted for a Pink Ladies ensemble, pairing her jacket with front split bejewelled trousers.
David Walliams went all out in a yellow midi skirt as he took the role as Sandy.
Amanda recently joked about her boss Simon Cowell, saying he has been “rubbish” at timekeeping during the latest series of Britain’s Got Talent.