Gyllenhaal takes the reins during a horseback-riding lesson near London. Plus: Pete & Ashlee, Ben Affleck, Naomi Watts and more

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HORSING AROUND

Jake Gyllenhaal saddles up in preparation for his latest film, Prince of Persia: The Sands of Time, with a horseback-riding lesson Thursday near London. Also in the U.K.: the actor's girlfriend, Reese Witherspoon, who's been spotted shopping around town.