Rihanna - file

Rihanna has helped save the life of a leukaemia patient.

The 'Umbrella' singer was so moved by mother-of-two Lisa Gershowitz Flynn's story she joined forces with DKMS, the world's leading bone marrow donor centre, to find her a match.

The 41-year-old New york  lawyer was diagnosed with acute myelogenous leukaemia, a fast-growing cancer of the *lo** and bone marrow last November, and was given just four to six weeks to find a donor.

Following Rihanna's public plea for help, 5,000 potential donors contacted DKMS and a match has now been found.

Lisa broke the happy news to her supporters in an email, saying: "Today, a 32-year-old guardian angel consented to be my donor, even though in all likelihood, she has never met me and does not know who I am."

Lisa, who has a five-year-old son, Michael, and three-year-old daughter, Alexandra, said no words could ever describe how thankful she was.

Last month, Rihanna, 20, explained her decision to help Lisa, saying: "When I heard about Lisa's plight, my heart broke. I said. 'I need to get the word out about Lisa right away'."