Robert Pattinson and his sexy, short new 'do were hard at work yesterday on the set of his new flick, "Water for Elephants."

The "Twilight" star was spotted leading horses around the Filmore, California set -- where Reese Witherspoon also reported for duty. (See more Pattinson pics!)

The flick is based on the book of the same name, which revolves around one man's experiences in a traveling circus.

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