The actor will join previously announced Zoe Kazan and Jake Johnson, reports Deadline.
The upcoming dramedy follows a shy young woman who assumes the identity of her deceased twin sister.
Jenée LaMarque serves as the writer and director for the film, which will shoot in Los Angeles.
Livingston was recently seen in Game Change, the HBO political drama about the 2008 US presidential election centring on Sarah Palin.
Palin was portrayed by Julianne Moore, while Livingston starred as Palin's senior adviser.
Livingston was previously cast in the indie drama Fort Bliss opposite Michelle Monaghan.
Watch the trailer for Game Change below: