LONDON (Reuters) – The mystery over the identity of the screenwriter of “Logan Lucky” deepened on Monday when actor Adam Driver said the woman had been on the set of the heist caper movie.

“Logan Lucky,” directed by Steven Soderbergh and set in the world of NASCAR racing, has made headlines because of speculation over whether its first-time screenwriter, Rebecca Blunt, really exists or is a pseudonym.

Driver’s remarks appear to be the first reported sighting of Blunt.

Asked at the film’s London premiere on Monday whether he had met Rebecca Blunt, Driver told Reuters Television: “Yeah.”

“So she is real?,” Driver was asked.

“Yes, she’s been on set,” Driver added.

The Hollywood Reporter, citing multiple unnamed sources, said in July that no writer named Rebecca Blunt existed and that the name was a ruse that deceived Driver and his co-stars Daniel Craig and Channing Tatum while the film was being shot.

The Hollywood Reporter in July noted that Blunt has no other mentions in movie and film union databases and has never been interviewed or photographed during promotions for the film.

The trade publication also recalled that Soderbergh invented names for what was in fact his work as a film editor and cinematographer on his 2015 film “Magic Mike XXL.”

Soderbergh responded in July to the speculation about Blunt’s existence by telling Entertainment Weekly, “When people make a statement like that, they should be very careful, especially when it’s a woman screenwriter who is having her first screenplay produced.”

“Logan Lucky” opened in U.S. movie theaters last week and starts its European rollout this week.