This may not come as a shock, but Kristen Stewart has dropped out of starring in the gritty actioner Cali.  Directed by Nick Cassavetes (Alpha Dog), the film was poised to start shooting within the next month or so but Variety’s Josh Dickey tweeted last night that the outlet could “confirm web chatter that Kristen Stewart has dropped out of Cali.”  No reason was given for the departure (take a wild guess), but Dickey notes that reports of a replacement actress are premature.Stewart was poised to make her producorial debut on the project as well, but no word on whether she’ll stay on as an executive producer.  Alex Pettyfer was recently set as the male lead in the pic which revolves around two San Fernando Valley lovers who sell a fake snuff film and take off with the cash.  With Cali off the books, Stewart now has no confirmed commitments in the coming months besides the press rounds for The Twilight Saga: Breaking Dawn – Part 2.  She recently landed the lead in Scott Cooper's Lie Down in Darkness, but that won't start filming until next year.