Actor Thomas Mann (It’s Kind of a Funny Story) is in final negotiations to join two upcoming projects. First up, the actor is in talks to star alongside Victoria Justice (TeenNick’s Victorious) in Fun Size. Marking the feature directorial debut of Josh Schwartz (creator/executive producer of Chuck, Gossip Girl), the film tells the story of a teenage girl who loses her younger brother trick-or-treating on Halloween. Variety reports that Mann will play Roosevelt, “the star of his school's debate team who is in love with Justice's character, Wren.” He aids Wren in the search for her brother. Max Werner (The Colbert Report) wrote the script.Hit the jump for news on Mann joining the cast of the indie drama As Cool As I Am with James Marsden and Claire Danes, as well as a synopsis of the book. Mann is also in talks to star in the indie As Cool as I Am. The film stars James Marsden and Claire Danes and is based on the novel by Pete Fromm. Variety reports that Max Mayer is set to direct the flick, which centers on “a 16-year old Montana girl with a turbulent home life.” Marsden and Danes are set as the girl’s parents, with Mann looking at the role of the girl’s best friend. Mann’s career is starting to heat up, as he’ll next be seen in the Todd Phillips-produced Project X, and is currently filming Hansel and Gretel: Witch Hunters.Here’s the synopsis for As Cool As I Am:

Spirited and sharply intelligent, if sometimes farfetched, this knowing coming-of-age story follows Lucy Diamond of Great Falls, Mont., for two years, from 14 to 16. They're turbulent years, but more so for Lucy because her parents, themselves married as teenagers, are both self-centered, trying to recapture the youth they feel they missed. Chuck, her father, appears only for a few days every few months; he is a charmer, and Lucy has inherited his humor and smart mouth. Though he claims to be a logger, it becomes clear that there must be other reasons for his long disappearances. Lucy's mother, Lainee, frustrated by her absent husband, has a long string of boyfriends, all of whom, like her husband, eventually disappear. Lucy, meanwhile, drifts into an affair with her best friend, scrawny, funny Kenny, whose divorced mother is an alcoholic. Then Kenny, too, is forced to move away when his mother loses custody, and Lucy recognizes she is in the same boat as her mother, her happiness contingent on the infrequent appearances of a traveling man. Lucy, clever beyond her years (what 16-year-old would think "It wasn't ten minutes before another bold five-year plan of abstinence lay in shambles"?) is such a plucky, proud, vulnerable character that the reader can't help falling for her. All the characters come alive, their stiletto tongues alternately wounding and caressing. Kenny, who truly loves Lucy, is sympathetic not just for himself, but for all the Kennys of the world who have little going for them but a kind nature and a true heart. When Lainee and Lucy finally bring their waiting days to an end, the unlikely conclusion owes more to fantasy than reality, but the emotions Fromm plumbs are painfully, poignantly real. [Amazon]