Although all of the ads for the new romantic comedy Friends with Kids play up the movie's impressive ensemble -- Jon Hamm! Kristen Wiig! Maya Rudolph! Megan Fox! -- they don't indicate that Adam Scott is actually the movie's leading man. The Parks and Recreation star plays Jason Fryman, a single-and-loving-it New Yorker who decides to enter into an unusual arrangement with his best friend, Julie (Jennifer Westfeldt, who also wrote and directed the movie): they'll have a kid together and share joint custody, but since they're not actually attracted to each other, they won't bother with marriage. At first, this arrangement gives Jason the best of both worlds as he's able to experience the fun of fatherhood while also being able to indulge his single guy hormones by dating a smoking hot Broadway dancer (Megan Fox). But then... well, you'll just have to see the movie for yourself. In town for the movie's premiere, Scott spoke with us about how he scored the gig and what costume he wore for Halloween last year. (Hint: He previously donned it for a very popular episode of Parks and Rec.)