The star belted out the lyrics to Stevie Wonder's For Once In My Life in the last round of the popular ITV singing competition.
Get exclusive celebrity stories and fabulous photoshoots straight to your inbox with OK!'s daily newsletter. You can sign up at the top of the page. Several clues pointed to the Robin being the Aston as he previously mentioned being "usually blue", which has been a staple colour throughout his career and influenced his red carpet outfits.
AstonMerrygold ❤️🤗♥️😍😍
AstonMerrygold He should have won 💙
AstonMerrygold Amazing!!!! Loved you singing! Xx
AstonMerrygold I knew it was him from day one
AstonMerrygold We all KNEW it 👀
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