Naomi Watts doesn`t know how to play Marilyn Monroe in biopic

London: Naomi Watts has admitted being daunted by the prospect of playing the sexy Marilyn Monroe in the new movie `Blonde.`

The 42-year-old actress is set to play the role of Monroe in a biopic and isn`t sure where to start. "I don`t have a plan yet on how to do it, it`s going to be a huge undertaking because everyone obviously has their own idea about who she was," a news daily quoted Watts, as saying. "It`s a high-pressure thing to take on because of how iconic she was. "I don`t know how I`ll go about it," added Watts. ANI