The 30-year-old former Destiny’s Child star, who sits on the judging panel alongside Tulisa Contostavlos, Louis Walsh and Gary Barlow, said in her fashion column for Glamour magazine: 'I had so many amazing options that were absolutely gorgeous, but the reaction on my face when I saw this particular dress indicated that THIS was THE dress for me.
'I literally had [goose pimples] and was just speechless for a few minutes, I just kept staring at how amazingly executed this dress was.
'After a while, when I could speak, I couldn't stop raving to my stylists about how much I loved the structure, the detail, the embellishment, the intricate detail in the embellishment, just the whole design of the dress.
'It's young, super-sexy and a show-stopper, so the decision was made for Atelier Versace to give me this dress for the first live show.”
She added: 'I was so happy and honoured that Donatella [Versace] was so willing to give it to me and her design team did some last-minute tweaks this afternoon to make it fit extra-fabulous [sic].'