The film's director, Bryan Springer, posted a pic with the pair on Instagram.
The Oscar-winning actress is reprising her role as blue-skinned mutant Mystique opposite Hoult, 25, who plays the blue-furred Beast.
Lawrence, 24, had said it will be her last time playing the character.
The exes, who met while costarring in 2011's "X-Men: First Class", split last August.
Lawrence moved on with Coldplay's Chris Martin, while Hoult was spotted with former "Glee" star Dianna Agron in England in April.
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