Rihanna is a big sweetheart!

Rihanna Promotes 'Rated R' at Best Buy

Rihanna Promotes 'Rated R' at Best Buy

A very special fan, Jasmina Amina (who has leukemia and who Rihanna helped with a campaign to get her a bone marrow transplant) went to see Rihanna at her Best Buy autograph signing. How sweeeeet!!!!