Elsewhere, a third praised: "I love seeing artists from way different gens transcending time together and I hope @RealSirTomJones lives forever. The years haven't touched you Sir Tom, same powerful voice."
And a fourth echoed: "This is so so good. How on earth can Tom sing like this still. Amazing," followed by an applause emoji.
A fifth concurred: "#TheVoiceUK The Stand By Me duet with Sir Tom and Anne-Marie was beautiful."
While a sixth suggested: "Anne Marie and Tom Jones performing a version of Stand By Me was heartwarming. They should release that as a single. #TheVoiceUK." (sic)
The praise for Jones comes just a few episodes after a handful of ITV viewers raised concerns about his appearance.
After spotting a mark on the singer's face, a number took to social media to share their worries, including one person who penned at the time: "What's that new spot on Tom's face? Hope it's ok...#TheVoice."
"What has Sir Tom Jones done to his face?!! I love him but please Tom, don’t touch the face!! #TheVoice," a second added amid the concern.
However, following Jones and Anne Marie's show-stopping duet, the 83-year-old has proven he's just as sprightly as ever.