The 22-year-old actor will play Chris, the lover of Mya to be essayed by Stewart, in the motion film to be directed by Nick Cassavetes, reported Variety.
Zev Foreman and Craig J Flores are in line to produce the film, with Brian Levy, Nicolas Chartier and Stewart set to executive produce on the film, which will be the brunette beauty's first producing credit.
Production on "Cali" is due to start later this summer and the film is expected to be released next year.
Pettyfer previously starred opposite Dianna Agron in 2011 sci-fi film "I Am Number Four" and his latest role saw him portray a stripper, Adam, in "Magic Mike".