Emma Dumontmakes a big reveal…revealing that they are non-binary – and that their friends and family are calling them by a new name.

The “Oppenheimer” star changed his pronouns and name Instagram bio Recently, they have started using the pronouns “they/them” instead of “she/her” when writing.

We reached out to a rep for Dumont, who tells TMZ, “You identify as a transmasculine, non-binary person. Their working name will continue to be Emma Dumont, but to friends and family they will call themselves Nick.”

Dumont’s career took off in recent years… and Emma played leading roles in Paul Thomas AndersonLicorice Pizza and Marvel’s TV series The Gifted.

Last year they gained international attention when they starred Robert OppenheimerHis sister-in-law Jackie in the blockbuster hit “Oppenheimer.”

Emma has posted several times in the last few weeks… published selfies and other pictures in various posts – but without really discussing her recent coming out.