Missing People Choir, made up of individuals who have suffered the loss of friends or family members who have gone missing, wowed judges and Britain's Got Talent viewers alike with their heartbreaking audition, singing an original song penned by one of the members, titled I Miss You.
The 38-year-old ITV judge exclusively opened up to Express.co.uk about the emotional moment when the charity choir first performed, saying: "I was really proud to be a part of the show when that aired.
"I just thought, 'this is how you use your platform responsibly'," she continued.
"It was such an important message, it was so beautifully done and I think everyone watching had empathy for them and compassion for them and respected them and admired them."
Alesha said that the nation are behind Missing People Choir '100 per cent'
The Missing People Choir are hotly tipped favourites to win the show Britain's Got Talent stars: where are they now Sat, April 15, 2017
Britain's Got Talent stars: then and now. A gallery of past winners and runners up on the popular show.
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Susan Boyle was runner-up to Diversity on Britain's Got Talent in 2009 has since toured the world, performed for the queen and sold millions of records
With the Missing People Choir hotly tipped as favourites to win the show, Alesha added: "I think the nation's behind them 100 per cent so they could win. It's all down to that performance on the night."
The choir will take to the stage in the last semi-final of the series tonight when they go up against the likes of Amanda Holden's golden buzzer act, comedian Daliso Chaponda, impressionist Jess Robinson and rival choir Perfect Pitch.
Alesha previously revealed that Ant and Dec's golden buzzer choice Matt Edwards could be the "dark horse" of the competition, hinting that she could see the magician potentially going on to win.
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Alesha also said that Matt Edwards was the 'dark horse' of the competition
The Pensionalities made it through to the final after last night's performance
Praising Matt's "old-fashioned" and "family-friendly" trickery, she insisted: "I just can't call it. At this point in the competition now, it's anyone's game."
Her own golden buzzer act MerseyGirls, previously known as Just Us, made it through to Saturday's grand final after coming second to elderly crooning duo The Pensionalities in the public vote.
Alesha backed the dance troupe, telling Express.co.uk: "I'd love to see them go all the way."
Britain's Got Talent continues tonight at 8pm on ITV.