Chris Klein — Booze Almost Killed Me

American Pie’ actor Chris Klein says he had such a terrible problem with alcohol … it nearly killed him.

our sources broke the story … Klein was arrested in 2010 for driving on an L.A. freeway with an EXTREMELY high blood-alcohol level … and checked into rehab shortly after the bust.

Now, Klein is telling … if he didn”t get help, “I would have died, and I think about that every single day.”

Klein says his drinking “got to the point where I was a fragile shadow of the young man that came into this business. Today, I”m the luckiest guy alive”