Rihanna and Ashton Kutcher?

There are rumors flying about pop superstar Rihanna hooking up with the former Mr. Demi Moore, aka Ashton Kutcher. The singer was reportedly spotted arriving at Ashton's home in the wee hours one day last week, and Kutcher's ex-wife Demi is supposedly heartsick over the news.

“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," an 'unnamed source' told Grazia magazine.

“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," they added.

“Demi can’t believe Ashton would do this," another source claimed. "She’s really hurt by the rumours and feels humiliated he’s being linked to other celebrities just a few weeks after she got out of rehab.