Rebecca Ferguson as Lady Jessica Esteemed actor Rebecca Ferguson stars alongside Chalamet in "Dune: Part II" as Lady Jessica, Paul's mother. Ferguson has an extensive acting career, with credits spanning multiple "Mission Impossible" films, as well as "The Greatest Showman" and "Doctor Sleep." She recently wrapped up production for a new "Mission Impossible" film, and is currently filming another. Image Source: Getty / Bertrand Rindoff Petroff