AZ Cardinals Star Chris Johnson Surprises His Mom With a Range Rover

AZ Cardinals running back Chris Johnson is definitely up for the Son of the Week honors -- CJ2K just surprised his mom with his BRAND NEW RANGE ROVER ... and the video is great!

Why the new car? Why not? He's rich and she wanted a new whip. It's that simple.

Johnson's mom couldn't have been happier -- she actually starts busting out a DJ Khaled "I Got The Keys" dance.