According to The Sun, the two singers are fans of one another for a long time.
Rod contacted Bonnie about finding out what their voices would be like together. Bonnie responded by daring Rod to record a full album.
The album will be a collection of covers of some of rock’s biggest songs, plus a few written by Rod.
The album is expected to be completed by Christmas. Click here for more details.

GRAZ, AUSTRIA – DECEMBER 30: Singer Bonnie Tyler performs during the New Year’s Eve tv show ( Silvestershow ) hosted by Joerg Pilawa on December 30, 2017 in Graz, Austria. (Photo by Michael Gruber/Getty Images)