Chris Martin and Jennifer Lawrence are still going strong, but there is one issue in their relationship: Lawrence's ex boyfriend Nicholas Hoult.

Lawrence and Hoult are shooting X-Men Apocalypse in Canada together, and according to reports the former couple are getting along really well.

A report in Heatworld says Lawrence and Hoult are in a "routine of lunching together every day" while filming the movie in Canada.

The film's director Bryan Singer, posted a picture with the pair on Instagram on 21 May.

Back with the #thekidsinthehall #jenniferlawrence #mystique #nicholashoult #beast #Xmen #XMenApocalypse

A photo posted by Bryan Singer (@bryanjaysinger) on

The Oscar winner is reprising her role as blue-skinned mutant Mystique opposite Hoult, who plays the blue-furred Beast.

Is Chris Martin worried about the Hunger Games star getting back together with her ex?

According to OK magazine, all is good between Lawrence and Martin, because she assured her new man that it's over with Hoult.

"She laughed off his fears," the source said, though Chris "knows enough people in this town to get a message to Nick to leave her alone."

As for Hoult, he has been linked to Dianna Agron, though a source said "of course he'd go back" to Lawrence if he breaks up with the Coldplay singer.

"Nick's madly in love with her and that will never change," the source revealed.