London Hollywood star Demi Moore is said to be devastated over claims that her estranged husband Ashton Kutcher has started dating R&B; star Rihanna. The 49-year-old is reportedly upset after Rihanna was pictured leaving Kutcher's home last week, reported Daily Express. "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 source said. "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. She's in a terrible way but, at the end of the day, Ashton is a single man and free to do whatever he likes," the source added.