Nellie Andreeva

EXCLUSIVE: Jemima Kirke and Allison Williams have landed the two leads opposite Lena Dunham in Dunham’s HBO comedy pilot executive produced by Judd Apatow and Jenni Kohner. Also cast in the pilot in a supporting role is Adam Driver (HBO’s You Don’t Know Jack).

The untitled comedy, which 24-year-old prodigy Dunham wrote and will direct/co-executive produce, is about the assorted humiliations and rare triumphs of three girlfriends in their early 20′s: Hannah (Dunham), an eternal intern at a publishing house in SoHo and a hopeful writer; Marnie (Williams), a sexy, bitchy and ambitious assistant at a slick political PR firm whose goal id to practice environmental law; and Jessa (Kirke), a space cadet with hippie tendencies who wants to be an artist/educator. Gersh-repped Driver will play a handsome but slightly off carpenter with whom Hannah has been sleeping for the past 7 months.

Kirke co-starred opposite Dunham in Dunham’s much buzzed about feature Tiny Furniture, which won the top prize at this year’s South by Southwest and just earned two Gotham Film Awards nominations. Dunham was the writer, director and star of the film, with Kirke playing her friend. (photo of the two from the movie is above; the trailer for the movie, which features Dunham and Kirke, is at the bottom of the story.) This seems to be the first major professional acting gig for Williams who graduated from Yale earlier this year and is pursuing a career as an actress and a singer. The daughter of the NBC Nightly News anchor Brian Williams has gained online popularity with several videos, including the viral That’s Why I Chose Yale and her recent performance of the Mad Men theme song (video below).

TV Editor Nellie Andreeva - tip her here.