Rihanna‘s heart is as big as an ocean. The pop star is taking time out of her busy schedule to help 26-year-old Seun Adebiyi, a Nigerian athlete who had hoped to compete in the 2014 Winter Games in skeleton sledding, but was diagnosed with Leukemia during training, a bone marrow donor.

Rihanna got a heartbreaking letter from Seun and promised him she would do anything in her power to help him out.

Rihanna said:

“Leukemia interrupted Seun’s dream of being the first Nigerian in the Winter Olympics, but together we can help him make his dream come true. We need to find him a bone marrow donor! Please sign up with DKMS!”

And she’s not alone in her search. Grey’s Anatomy actor Justin Chambers is also asking potential bone marrow donors to come forward and help save the life of the Yale Law School graduate.

Seun is astonished both Rihanna and Justin have taken the time to help him. He said:

“I am deeply touched by their plea for donors, not just for me, but for others as well.Their voices are so powerful and it encourages me how they used their influence to raise awareness about this important issue. That was incredible.”

This isn’t the first time Rihanna has used her star power for a good cause. Back in 2008 she made public pleas to help six-year-old Jasmina Anema and 43-year-old Lisa Flynn find bone marrow transplants. What an inspiration!