Down On Me (Keenan Cahill and 50 Cent)

Keenan Cahill, an adorable 17 year-old youngster [then 15] who recently hit it big on YouTube by uploading videos of himself singing and dancing–he made his television debut last week…

Keenan Cahill has a rare genetic disorder called Maroteaux-Lamy Syndrome, also known as MPS-VI. The disorder affects one in 25,000 people and has no known cure.