Except, we're guessing things weren't actually that awkward as the former flames are actually good friends. Still, getting stuck in a lift is not exactly ideal, but that's exactly what seemed to happen to the pair and the rest of Joe's band DNCE.
He took to Snapchat to document the ordeal with his fans and panned the camera around the group to show everyone looking a little fed up.
Joe explained: "We've been stuck in an elevator for four hours. Four hours," while Demi pulled a less than impressed face at the camera.
Luckily, though, they did manage to make it out (despite the wait) and made it on time to perform at their LA Live concert, over in the States. Phew!
Their lift trouble comes after Demi has recently been on the road with her good pal and Joe's brother Nick for their Future Now tour that they had co-headlined. She has known the brothers since initially meeting them on set of Disney movie Camp Rock - in which they all starred alongside each other way back when in 2008.
Brings back memories, right?
She and Joe went on to date, splitting in May 2010, before Demi then got together with That '70s Show actor Wilmer Valderrama. They announced their split three months ago (in June this year), after six years together.
In a joint statement, they said: "After almost 6 loving and wonderful years together, we have decided to end our relationship.This was an incredibly difficult decision for both of us, but we have realised more than anything that we are better as best friends. We will always be supportive of one another."
Take a trip down memory lane with this Camp Rock gem:
Follow us on Twitter @RevealMag for all your celeb, fashion and beauty news!
Fancy winning some GREAT prizes? Check out Reveal Competitions here!