According to the Daily Star, the 32 year old feels it is time to change her image.
A source revealed: "An approach was made to Cameron but she turned it down flat. It was not a firm offer, more that the producers wanted to sound her out as a possibility."
"I think she wants to get away from her ‘Charlie’s Angels’ image and get on with more serious roles", added the source.
The next film starring Cameron Diaz is the romantic comedy In Her Shoes, which opens in October.