London: Actress Demi Moore is reportedly heartbroken after hearing reports that her estranged husband Ashton Kutcher is dating singer Rihanna.

The 49-year-old, who recently completed a stint in a rehab for a reported eating disorder and addiction, was devasted when she saw a picture of Rihanna making a late night visit to Kutcher`s home.

"Demi is constantly keeping tabs on Ashton, so when these pictures came up she was understandably devastated. Demi`s convinced something happened between them and said she felt `sick to her stomach`," a website quoted a source as saying.

"Demi`s been acting crazy ever since, trying to find out information about the pair. Demi is in such a fragile state, even the idea of them together has affected her quite badly," the source added.