When it comes to cleaning up a polluted river, Gisele Bundchen prefers to use thongs… the flip-flop kind, that is.  She’s hocking $25-a-pair sandals and giving the proceeds to clean up the Xingu River, part of the Amazon River basin.

And the $35 million-dollar-a-year supermodel says that her desire to help was birthed before she was famous.  She told press, “I always wanted to visit the Amazon, and when there, I realized how dirty the water was and how it was affecting the health of kids, and just how everyone was living.’’

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