The 47-year-old blonde bombshell showed off her trim figure in a stunning blush pink number which featured a dramatic ruffled skirt and train.
The strapless gown teased a glimpse of her famous assets, but Amanda Holden started the live shows off relatively modestly.
Displaying the floor-length dress to its full potential, she shared a shot with her 706,000 Instagram followers, posing with one hand on her hip to accentuate her svelte frame.
The Britain’s Got Talent favourite wore her golden tresses pulled back in a stylish up ‘do and ramped up the glamour with heavy smokey eyeshadow.
Meanwhile, Alesha Dixon, 39, unveiled her jaw-dropping look in a dazzling gold dress.
Alesha teased a peek at her preparations on Instagram, sharing a snap of herself in the make-up chair earlier this afternoon with her 555,000 followers.
The brunette beauty could be seen dressed in nothing but a short white bathrobe while a make-up artist began working on a dramatic smokey eye.
“Glam time! @BGT live,” she captioned the upload.
Last year, Amanda set tongues wagging with a variety of eye-popping live show looks, with one even amassing a staggering 663 Ofcom complaints due to its flesh-flashing nature.
The ensemble in question comprised of a jaw-droppingly low-cut dress, which the BGT favourite opted to wear without a bra underneath.
She showcased her slender curves in the dangerously plunging number, which clung in a tight-fitting bodycon style, revealing a generous glimpse of cleavage and sideboob.
Despite coming under fire from some fans for her risqué displays in the past, Amanda vowed to wear yet more boob-baring outfits ahead of last year’s live semi-finals.
“Will people be complaining to Ofcom? I hope so,” she told The Sun on Sunday. “I haven’t done my job if they aren’t.”
Speaking about the dresses, which did indeed go on to spark controversy, she added: “I can’t wait to wear my dresses. They are very flattering, very feminine and a few are… what you would expect.”
This year, viewers are sure to be expecting more daring looks from Amanda and her fellow judge Alesha.
Tonight, the first eight acts will take to the stage to win the public vote and attempt to secure themselves a place in Sunday night’s live final.
BGT judge Amanda Holden previously revealed last minute changes ahead of the first semi-final, admitting her outfits often get switched on the day of the show.
“It can change on the day,” she told Saturday Magazine. “Lots of amazing designers see the show and send outfits at the last minute.
“You might get one sent by taxi and you go, ‘Oh, I’m wearing that instead,’ which happened last year,” she added.
Britain’s Got Talent continues tonight at 9.30pm on ITV.