Tom Jones and The Bee Gees Robin Gibb will appear on the charity single for this year's Comic Relief appeal.
Both singers have recorded backing vocals for the track, entitled 'Barry Islands In The Stream'.
The song is performed by Gavin and Stacey stars Ruth Jones and Rob Brydon as their characters in the show, Nessa and Bryn.
Brydon spoke about the song's forthcoming video on his Twitter fan page.
“The video's great, by the way. Acting and everything... Tom could be in The Sopranos,” he wrote on the micro-blogging website.
'Barry Islands In The Stream' is released as a digital download on March 8th.
Brydon and Ruth Jones were among a host of stars who attended the official launch for this year's Comic Relief Red nose Day appeal in London earlier today (January 28th).
Comic Relief launch