Richard Burton and Elizabeth Taylor did an incredibly successful Broadway, London and tourring production of Private Lives (playing a feuding formerly married couple) after the divorce.
Jack White tours with his ex-wife Meg.
Kirk Douglas and his ex-wife Diana (Michael’s mother) have been divorced for more than 50 years but played man/wife in their son’s It Runs in the Family and had previously worked together in The Indian Fighter.
Bette Midler and her former longtime live-in-love Peter Riegert appeared together in Gypsy 15 years or so after their relationship ended.
And of course the most famous duo would be Sonny & Cher, who had that surreal even for Hollywood moment where they sang I Got You Babe as Cher was heavy laden with Greg Allman’s baby.
Not quite the same, but I think Diane Ladd has directed her ex-husband Bruce Dern. I think her quote when she asked him to appear in her film was, “Bruce you were a lousy husband, but you’re a great actor.”
Chad Michael Murray and Sophia Bush of One Tree Hill married, then divorced a few months later … right as their characters were slated to get together.
SN<->LB
Lindsay and Stevie entered FM together. They broke up after the White Album('75) but before Rumours('77).
SN<->MF
This one happened during the 1980’s, if I recall correctly this was MF cheating on Sara Fleetwood with SN. Of course, MF acquired Sara Fleetwood when she was married to a label executive.
CM<->JM
This marriage broke up before Rumours.
To my knowledge, Mick snogged neither Lindsay nor John, and the women didn’t hook up either.
George Hamilton (why is he famous again?) and his ex-wife Alana Stewart (who was famous because she was once married to George as far as I can tell) had a daytime talk show years after they divorced.