The Hollywood Reporter has announced that Australian actress Jessica McNamee will play Rachel McAdams' estranged younger sister in The Vow, a romantic drama that starts shooting in Toronto next month.

The film tells the real-life story of a newlywed New Mexico couple (McAdams and Channing Tatum) who end up in a car crash. The wife is put in a coma, and when she comes to – without any memory of her husband or their marriage – the husband attempts to wins her heart again.

Scott Speedman will also appear in the film.

McNamee starred on the Channel Seven series Packed to the Rafter and in the horror movie The Loved Ones, which screened last year at the Toronto Film Festival and will release in Australia on October 28, 2010.