Rachel Platten Sings 'Fight Song' with Young Cancer Patient

Watch heartwarming video of the two singing the song together.

— -- In an inspiring video shared on Facebook today by the Children's Hospital Los Angeles, singer Rachel Platten stopped by to cheer up a young cancer patient and ended up signing a duet with a brave young boy.

"This video says it all," the hospital wrote on its Facebook page. "CHLA patient, Jeremiah, has a lot of heart and a lot of fight—thanks in part to his #FightSong! He surprised singer/songwriter Rachel Platten by knowing the lyrics to her hit single by heart. #ccam."

Jeremiah knows the lyrics and does his best to do the song justice, which is exactly what he does. You can see Platten start to break down herself witnessing the boy's amazing spirit.

"You are so amazing!" she says, after they finish singing.