Reunions with an ex can be a mixed affair depending on how it ended, just ask Charlize Theron and Sean Penn.

The couple dated for 18 months and were the picture of happiness at Cannes Film Festival last year.

Fast forward to this year at the star-studded film festival in France, and it’s a totally different story.

Sean and Charlize in Cannes ( Thibault Camus/AP)Sean and Charlize in Cannes ( Thibault Camus/AP)

While still a couple they made the movie The Last Face together, which is now being promoted by them both in Cannes.

At a press conference, photographs appeared to show Charlize giving him “evils” and at a photo call they appeared not to even acknowledge each other.

#Awkward.

But then, finally, at the red carpet premiere, they hugged. But it was frostier than the Arctic.

The photocall at Cannes (Joel Ryan/AP)The photocall at Cannes (Joel Ryan/AP)

Pictures showing the pair hugging show Sean looking bored as Charlize leans in for the embrace.

Oh dear.

Details of their break-up aren’t known, but she is quoted as telling the Wall Street Journal last year: “We were in a relationship and then it didn’t work anymore. And we both decided to separate. That’s it.”