Robert Downey, Jr.'s life is a great Hollywood success story: A famous 1980s actor struggles with drug and alcohol addiction but eventually overcomes all of his obstacles to have one of the biggest comebacks ever.
Most people know that story, but did you know that he can sing? It's true! He actually released an album in 2004 titled 'The Futurist,' on which he either wrote or co-wrote most of the songs. He also played the piano on the album!
Talk about impressive!
Click through this gallery for some more celebrities who are surprisingly great at singing!