Zac Efron posed with a lucky contest winner and signed autographs for other fans at a screening of Charlie St. Cloud in St. Louis yesterday. He's been busy showing off his movie across the country, with a stop at the Mall of America and a visit to Philadelphia. Zac was back in California for Tuesday's big LA premiere, which Zac attended with girlfriend Vanessa Hudgens. He left Vanessa's side for a moment to chat about his film and also express his support for incarcerated Lindsay Lohan.
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