Zac Efron and his girlfriend, Vanessa Valladares, reunited after rumors swirled that the couple had called it quits on their whirlwind romance.The High School Musical star, 33, was spotted with Valladares, 25, on Thursday, December 3, in Adelaide, Australia, where he is filming his upcoming movie, Gold. In photos published by the Daily Mail, Efron wore a black sleeveless shirt and shorts with matching sneakers while he carried a portable speaker.