Casting Net: Steve Carell will help Will Ferrell 'Swear to God.' Plus: Heather Graham's back for 'The Hangover Part III'

• Steve Carell and Will Ferrell will star, and actor-screenwriter Justin Theroux (Tropic Thunder) will direct, the comedy Swear to God. Ferrell, who has been attached to the film for a year, will play a self-involved money manager who believes he has seen God. Carell’s role is unspecified. Theroux will also rewrite the script, first penned by Alan Cohen and Alan Freedland (Due Date). [Deadline/Deadline]

• Heather Graham will reprise the role of Jade, the stripper with a heart of gold, in The Hangover Part III. The character did not appear in the 2011 sequel, but it appears she’s due for a reunion with her one-time husband Stu (Ed Helms). Bradley Cooper, Zach Galifianakis, Justin Bartha, Helms, and director Todd Phillips are all returning for the threequel. [Variety]

• Saoirse Ronan (Hanna) is attached for the eponymous role in Mary Queen of Scots, about the tumultuous life of the half-sister to Queen Elizabeth I. Appropriately, the screenplay was written by Michael Hirst, who penned Elizabeth and Elizabeth: The Golden Age — both of which earned star Cate Blanchett an Oscar nod for Best Actress. No director is yet attached. [Deadline]

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