The panellist came under fire from viewers after she offered her feedback to vocal group Vox Fortura during Wednesday (25 May) night's show.
The foursome had just finished performing a stunning version of David Bowie's 'Heroes', when Alesha commented: "Four sexy chocolate men with amazing voices, polished to perfection. That was sensational."
Many fans criticised the former Mis-Teeq singer for her comments about the group's race.
It wasn't the first time Alesha landed herself in hot water during Wednesday's show, however.
She found herself being told off by host Declan Donnelly after using unorthodox methods to get dance act Bespoke Candi off stage during their performance.
Watch Vox Fortura's performance in full in the video below...
'Britain's Got Talent' continues tomorrow night at 7.30pm and 9.30pm on ITV.