After his arrest last week for driving while in intoxicated on an L.A. freeway, actor Chris Klein has checked into rehab, according to People magazine. The American Pie star admitted himself into the Cirque Lodge in Utah to undergo a 30-day alcohol treatment program. “After recent events, Chris was forced to take a clear look at a problem he has been trying to deal with himself for years,” his rep tells the magazine. “He understands now that he can not beat this disease alone.”