Looks like Alfonso Curaon will have to find another another leading lady for his 3-D science-fiction epic, Gravity. Deadline reports that Natalie Portman, like Angelina Jolie before her, has passed on the film, meaning Warner Bros. will now try to cast Gravity with Plan-C. Agents for Naomi Watts, Marion Cotillard, Carey Mulligan, Scarlett Johansson, Sienna Miller, Abbie Cornish, Rebecca Hall, Olivia Wilde and Blake Lively should expect a phone call. [Deadline]