Published Tuesday, 09 October 2012
Jahmene Douglas closed Saturday's show with a rendition of Imagine (© Rex Features)
In an unexpected development, Lennon's widow took to Twitter to tell Jahmene that she had heard his performance from Saturday night's live show.
"It was beautiful, Jahmene!" she tweeted. "I love you!"
Jahmene had kept the audience transfixed as he sang Imagine, at first simply perched on a stool and surrounded by flickering candles and then joined by a gospel choir as he showed off his impressive vocal range.
And after the 22-year-old supermarket worker became the final X Factor contestant to take to the stage, the judges were practically climbing over each other to praise him.
"I'm so glad Nicole picked you 'cause you did one of my favourite auditions ever on X Factor. You are amazing," Louis Walsh enthused.
"You don't have the confidence that the other contestants have, but you have the talent - I am your biggest fan."
But Louis might have competition if he wants to be head of Jahmene's fan club, from fellow judge Gary Barlow.
"Jahmene, you are a supreme singer," the Take That star said, although he did follow that up with a little warning about not over-singing - which he added he said as "one of your biggest fans".
But all the praise may just have been topped by that tweet from Yoko Ono.
Meanwhile, Mr Barlow has also taken to Twitter to admit he's been struggling a little since the controversial axing of one of his acts.
Carolynne Poole lost out in the weekend's public vote to flamboyant singer Rylan Clark, after Louis Walsh sent proceedings to a dramatic deadlock - with the result prompting her mentor to storm off.
"Been hard to get motivated," Gary tweeted, before adding his support for Carolynne.
"Good luck. Anything you need, I'm here," he said via Twitter.
And the X Factor is continuing to prove popular with viewers in Northern Ireland - with more than 430,000 people tuning in for Sunday's results show.
Almost half of all local television viewers were tuned to UTV for the show, with the X Factor picking up an average 48% share.
The first live show of the series peeked with a 60% share of viewers on Saturday night.