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http://imdb.com/title/tt0313812/

Directors: Joe Ma Wai-Ho, Mak Kai-Kwong
Starring: Miriam Yeung Chin-Wah, Edison Chan Koon-Hei, Niki Chow Lai-Kei, Wyman Wong Wai-Man, Pauline Yam Bo-Lam
Audio: Cantonese
Subtitles: English

From LoveHKFilm:
Hit film from Joe Ma's Brilliant Idea Group remakes an older film of the same Cantonese title. Singer Miriam Yeung stars as Fong, who works at an advertising firm and is at odds with high ranking colleague Monica (Pauline Yam). After an e-mail snafu buts Fong on the firing line, she decides to feign pregnancy as HK labor laws stipulate that pregnant women can't be fired for a period of 10 months.
The scam works, and Fong discovers that there are a lot of perks involved with her single mother status. She takes heavy advantage of that, securing help from her colleagues as well as fancy new digs from her overly-nice CEO (Edison Chan, in what has to be one of the weirdest casting decisions of the year). Ultimately the scam gets out of hand, the lies pile up, and we prepare ourselves for the expected comedic denouement.