I came across this song 'Can't Feel the Pain' by a chap called Brent Bourgeois (his real name apparantly). It has vocals shared with Christine McVie. I can't find much information about this specific song but from what I can tell it features on his album from around 1990. Does anyone happen to know how Chris came to sing on this? what's her connection? Don't know much/anything about Brent Bourgeois- seems he later became quite big(ish) in Christian rock. Anyway, this track doesnt blow me away but it's nice enough.
https://www.youtube.com/watch?v=CsvWXzkDGy8