Blake Lively will headline the upcoming Netflix movie Dark Days at the Magna Carta, a post-apocalyptic film centered on a woman fighting for the survival of her family.The Gossip Girl actress, 32, is collaborating on the project with filmmaker Shawn Levy, who recently worked with her husband Ryan Reynolds on an upcoming comedy called Free Guy.The Los Angeles native, who shares three kids with Reynolds - James, five, Inez, three, and a seven-month-old baby daughter - is also a producer on the streaming film via her company B for Effort, according to The Hollywood Reporter, while Levy's 21 Laps company is also linked to the project.