While Kirsten Dunst will return for Spider-Man 4, the actress is getting in a little sci-fi romance first. According to Variety, Kirsten Dunst and Jim Sturgess have joined the cast of Upside Down.

The film will be directed by Juan Solanas and, while story details weren't made available, the film was said to be a sci-fi fantasy film with Romeo and Juliet elements as well.

Production is set to start in mid-February in Montreal, aiming for a fall 2011 release.