Warner Bros. have released the first official trailer for Katherine Heigl's new movie for "Unforgettable". The Denis Di Novi directed thriller which is set to hit theaters on April 21, also features Rosario Dawson, Cheryl Ladd, Geoff Stults and Whitney Cummings.

Katherine stars as Tessa Connover, who is barely coping with the end of her marriage when her ex-husband, David (Stults), becomes happily engaged to Julia Banks (Dawson) – not only bringing Julia into the home they once shared but also into the life of their daughter, Lilly (Isabella Rice). Trying to settle into her new role as a wife and a stepmother, Julia believes she has finally met the man of her dreams, the man who can help her put her own troubled past behind her. But Tessa’s jealousy soon takes a pathological turn until she will stop at nothing to turn Julia’s dream into her ultimate nightmare.

The film is produced by Di Novi, Alison Greenspan and Ravi Mehta, with Lynn Harris serving as executive producer, from a script written by Christina Hodson. The behind-the-scenes creative team is led by multiple Oscar-nominated director of photography Caleb Deschanel, production designer Nelson Coates, editor Frédéric Thoraval, and costume designer Marian Toy. The music is composed by Toby Chu.

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