'I Could Be' features a pop hook with an" undercurrent of Irish folk and lyrics" offering contrasting outlooks from within a relationship.
The Irish stars blend their voices together for this track, which was co-written by Shane.
"I'm really happy Nadine is my duet partner for 'I Could Be'," says Shane. "I've always been a big fan of her voice and I'm really looking forward to the fans hearing it and performing it together."
Between their time in Westlife and Girls Aloud, Shane and Nadine have a pretty successful back catalogue, so no doubt this will be another hit!
Nadine adds: "I'm a huge fan of Shane's and used to love listening to his songs growing up. I love the track we've done together and I'm delighted to be part of his new album. I can't wait for us to perform it live!"
'I Could Be' features on Shane's new album, Right Now, which is out 25 September.
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