The 47-year-old singer asked the comedian-and-actor, 37, to feature on her forthcoming festive album, and the impressive collaboration has gone down so well with label bosses that the catchy track is tipped to be the lead single.
A source told The Sun newspaper: ''James recorded the track in secret with Kylie after she asked him to feature.''
The insider added: ''It was meant to be the jokey song on the album but producers were so impressed there's a strong chance it's going to be the lead single. James is a very good singer and the song is actually a great listen.''
The collaboration with Kylie, with whom he co-hosted the Brit Awards in 2009, comes just a year after James admitted he'd like to record his own Christmas collection one day.
He said previously about a festive album: ''Almost for my own enjoyment - and when I say my own enjoyment, I mean just to record for myself to keep in my house - I have started to think I should make a Christmas album.
''I love Christmas music so much that I start listening to it in October. I've started listening to the Michel Bublé album and I'm thinking maybe I'll just do it on my own.''
Meanwhile, the former 'Gavin and Stacey' star isn't the only one chosen to feature on Kylie's upcoming album as she's also asked her sister Dannii, 43, to do a duet with her.
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