The pair have recorded a cover of the Elaine Page and Barbara Dickson duet, 'I Know Him So Well', with the video set to premiere during tonight's BBC LOLathon.
"I just thought it would be a laugh and so I wrote to Susan Boyle and she was really up for it," Kay told The Bolton News."We have obviously added some funny bits in, but they are fairly subtle — I think it works better that way."
Remember, it's all for charity.