Chris Klein Checks Into Rehab

TMZ has confirmed actor Chris Klein has checked into rehab ... less than a week after his DUI arrest.

As TMZ first reported, Klein was busted on the 101 Freeway in Los Angeles ... with a blood alcohol level of more than .20, nearly three times the legal limit.

According to the Celebrity DUI Defense Handbook, Klein had to check into rehab within one week of his arrest in order to qualify for Really Focused on Getting Help status.

Klein has yet to be charged, but it never hurts to be prepared.

Klein's rep just released a statement saying, "After recent events, Chris was forced to take a clear look at a problem he has been trying to deal with himself for years."

The rep adds, "He understands now that he can not beat this disease alone. He thanks everyone for their support as he takes all the necessary steps to deal with his addiction and asks for privacy while doing so."

Klein was spotted at the airport this morning, flying from LA to Utah, heading to a rehab facility.