Smoke and fluid from right rear :(
 

http://i.imgur.com/1Hhbv1Z.jpg

Any idea what this might be? No warning/error lights go off on the dash and quite a bit of smoke was coming out of the right side after a leisurely cruise. The fluid is yellowish green. Once I turned the car off the fluid dump stopped pretty quickly and there is still coolant left in the rear tank.

The right rear above the wheel is the location of the coolant overflow. You likely had an air bubble in the system. Was the coolant temperature indicator past the 0 of the 180 mark?

I honestly was not paying attention I had the roof down listening to some sweet tunes with the birds chirping in the background. I pulled into my driveway turned the car off, looked over my right shoulder and noticed white smoke coming out of the right vent. I hopped out and walked around to the back and saw the dump.

Hopefuuly it's nothing more than a bad coolant cap. Same thing happened to me.
Good luck