United Kingdom, Aug. 11 -- Sharon Stone kept her mother's death secret for months because she wanted to be able to process her feelings in private.

The Basic Instinct star went public with the sad news in July - four months after Dorothy passed away in March at the age of 91 - and Sharon has now revealed she wanted time to grieve before she told the world about the family tragedy.

She told the Guardian newspaper: "Mom, Dot, actually died a few months ago, but I was only ready to tell the public about it now because I always get my mad feelings first when people die ...

"[It was] a little bit of anger and a little bit of: 'I didn't f****** need you anyway,' you know! ...

"Mom wasn't of a sunny disposition. She was hilarious, but she sa...