Barbadian R&B star Rihanna has already proven herself a fighter in her personal life and continued to do so after a brief hospitalization on Monday night. The 22-year-old performer was taken to a private clinic after her concert in Zurich, Switzerland around midnight with an injured rib. She “went to have it looked at to be sure it was nothing serious, and it wasn’t,” her rep told People. Rihanna was released about three hours later and continued with the European leg of her "Last Girl on Earth" tour Tuesday night in Lyon, France and is expected to perform in Marseille Wednesday night as well. “All is OK and the tour is going great,” the rep added.