The actor, 26, was arrested in Encinitas on Feb. 5--the same month he split from fiance Katie Holmes--while he was driving a 2003 BMW along a San Diego County highway.
According to the criminal complaint, Klein's blood-alcohol level at the time was 0.20--more than double the legal limit of 0.08 per cent.
On Friday, Klein was fined $1,800 and ordered to perform 150 hours of community service.
Klein's attorney Blair Berk says, "Chris dealt with this very seriously and responsibly and he's pleased that it's been resolved."
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