Former A+ list singer has been consoling another singer

This foreign born former A+ list singer from back in the day who has not had a hit in awhile after almost a decade of hits has been consoling another singer who is A- list.

I wonder if the A- lister knows the former A+ lister used to regularly have sex with the now former husband of the A- lister.

Former A+ list singer: Shania Twain (Canadian)
Miranda Lambert, Blake Shelton