Officials are currently investigating the cause of the horrific crash, which injured a 15-year-old girl, along with Kyle Glover, 11, son of Usher's wife, Tameka Foster.
GAAS/AP
Usher and former wife Tameka Raymond pose for photos with their children, including Kyle Glover, third from the left.
Usher's celebrity pals showed an outpouring of support on Twitter following the singer's terrible tragedy this past weekend.
The singer's 11-year-old...