2011 Toyota Camry SE Engine

I have a 2011 Toyota Camry SE. Today I was driving it and all of a sudden the engine
just revved up high and loud to about 6500 rpm. I looked out the mirrors and there was
white smoke billowing out the tailpipes. I pulled into a parking lot and turned the car off.
The smoke quit coming out and never came back out. The car is running fine as I had
to drive it home, carefully of course. It drove like it normally did but it has really
confused me on what caused the high rev all of a sudden and the white smoke. I
checked all the oil, fluids, etc and they are all fine and nothing was leaking out the
bottom other than water from the AC. Any help is appreciated. Thanks!