De Luca added that the two are really "enjoying" shooting together, reports contactmusic.com.
"The chemistry is there, they genuinely like each other. They're enjoying the story, the story is so powerful," Bang Showbiz quoted De Luca as saying.
Based on E.L. James' erotic novel of the same name, the film will see Johnson as Anastasia Steele, while Christian Grey will be seen as Dornan.
The film will hit the screens in February next year.