Simpson, 26, and Wentz, 31, bonded over fast food in their native L.A., hitting two different drive-through food spots in two days.
On Saturday, the spouses of nearly three years were photographed rolling up (with Wentz behind the wheel) for burgers and fries at In-N-Out burger.
The next day, the duo (parents to son Bronx, 2) continued the mobile greasy feast at another L.A. drive-through: a local Taco Bell.
No word yet on whether this portends a reconciliation or just a truly amicable parting.
Last week, Simpson turned heads when she went shopping in L.A. with a new guy, rocker Craig Owens, who affectionately put his arm around her shoulder.
A Simpson source told Us that the singer-actress and Owens, 26 (who happens to be a protege of Wentz) are simply "longtime friends."
More on Wonderwall:
More from UsWeekly:
- Aug. 23, 2016 Is Ariana Grande dating Mac Miller? Plus, more news
- Aug. 18, 2016 Nicky Hilton spent how much on a stroller for her baby?
- Aug. 23, 2016 Jessa Duggar Seewald is pregnant with her second child