New Delhi, June 13 -- Social media users were briefly convinced this week that several high-profile stars had joined romantic comedy One Month Mark, after a pair of hoax casting posts gained traction online and prompted an outpouring of enthusiasm from fans.

The first rumour originated from an account known as "Flop Updates", which shared a post designed to resemble an entertainment industry report. The post falsely claimed that Sebastian Stan had signed on to star opposite Lawrence in One Month Mark, an upcoming Apple Studios romantic comedy centred on a woman who has never managed to stay in a relationship for more than a month.

The project, which Lawrence is also reportedly producing alongside Chernin Entertainment, was recently anno...