Spinybacked Orbweaver

Spotted this spider on my way to the car as I was leaving work today. I'm pretty sure it's a spinybacked orbweaver (gasteracantha cancriformis). I thought it was really cool looking. I couldn't get around the other side to get a picture of the dorsal (top) side though.

This is the underside of the spider (ventral view).
Spinybacked Orbweaver

Here it is from the side.
Spinybacked Orbweaver side