“Mortal Instruments” star Robert Sheehan has joined Hailee Steinfeld in Dustin Lance Black’s romance movie “The Statistical Probability of Love at First Sight.”

The Exchange is launching international sales at Cannes while CAA is handling domestic rights. Production will begin later this year.

Black is directing from his own script, based on Jennifer E. Smith’s novel about a young woman who meets a young British man as she waits at John F. Kennedy Airport for a flight to London for her father’s second wedding.

Producers are Pacific Standard’s Bruna Papandrea, Caroline Kaplan and Steve Hutensky. Black is exec producing.

Sheehan will be seen next in Dean Devlin’s “Geostorm.” He is repped by Gersh and Lisa Richards Agency.