From ThisIs50.com:

50 Cent was in a bad accident [early this morning] as his bullet-proof SUV was rear-ended by a Mack truck on the LIE in NYC. He was put on a stretcher and taken to the nearest Queens hospital where they are currently running test on his neck and back. His driver is also currently in the hospital as the SUV almost flipped over. The truck driver reportedly told police his loaded shifted and lost control of the vehicle.

Source: http://www.thisis50.com/profiles/blogs/50-cent-in-a-car-accident-exclusive-pictures