Lamar Odom -- Checks In to Rehab ... According to Report

Lamar Odom has finally checked in to rehab to deal with his raging drug addiction ... this according to a new report.

People.com says Lamar has checked into a rehab facility ... but does not specify when or where he started treatment.

Lamar was seen out in public over the weekend ... so the move to rehab had to be very recent.

As TMZ first reported ... the 32-year-old NBA star has been struggling with drug addiction for years, and most recently he's gotten hooked on crack. Lamar was arrested for DUI last Friday.