Amanda took to the stage wearing a plunging nude gown, with a sheer cut-out panel showing off her thigh- Angelina style.
And many viewers were unimpressed, taking to Twitter to voice their disapproval.
Debbie Greenwood posted: 'Omg. Just got home. Daughter watching ITV and Amanda Holden has forgotten to put the front of her dress on!'
Nerys Ruth Thomas said: 'Amanda Holden, is your dress really appropriate to wear for a family show and before the watershed?' while Robyn Amelia added: 'I'm sorry, but the dress Amanda Holden is wearing for BGT isn't exactly appropriate a family show.'
Karen Appleyard simply said: Dress too much/too little for a family show. Cover 'em up love!'
But the mother-of-two didn't appear too bothered by the outcry, taken to the stage during yesterday's fourth live show in a strapless sheer sparkly number.
Meanwhile her fellow judge Alesha Dixon dressed more conservatively, wearing a lace skirt, white top and matching blazer.
But it's not about the judges. Yesterday's broadcast saw Isaac Waddington and The Neales chosen as the next finalists to be selected front the Britain's Got Talent semi-finals.
And ice king Simon almost got teary, admitting: 'That actually got quite emotional. What has happened to me? It was a perfect song. I really like you guys.'
Aw, fatherhood is softening you up Simon!