Duchovny and Leoni have an 18-year-old daughter Madelaine and a 15-year-old son Kyd together.
Fuller and Anderson have a well-established working relationship, dating back to the actress' portrayal of psychoanalyst Dr.
Duchovny and Leoni married in May 1997 and he checked himself into a rehabilitation center in August 2008 for treatment of sex addiction several months after they separated.
They reconciled but split again in June 2011 and their divorce was finalized in June 2014.
Earlier on Monday, the two had attended the Fox Upfront Presentation in New York with Anderson ditching the crutches as she stood to pose for photos.
The actress wore a sleeveless black dress dotted with red roses and managed to get her broken foot into black sandals for the occasion.