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

HOUSE OF CARDS

Ben Affleck gives his best poker face at the Ante Up For Africa event hosted by Don Cheadle Wednesday at the Rio Hotel and Casino in Las Vegas. The actor competed with B.F.F. Matt Damon, Adam Sandler and a slew of other stars at the poker tournament to raise money and awareness about the genocide in Darfur.