Lindsay Lohan Rehabbin' at Betty Ford

9/30/2010 11:00 AM PDT BY TMZ STAFF
TMZ has learned ... Lindsay Lohan is undergoing treatment at the famous Betty Ford Center, a legendary and respected alcohol and drug rehabilitation clinic in Rancho Mirage, California.

Lindsay checked in Monday -- and as we previously reported, the plan is for her to stay put in rehab at least until her probation violation hearing on October 22.

It's gonna run Lindsay a pretty penny too -- according to their website, 30 days of inpatient care at BF runs $26,000.

Betty Ford has treated scores of celebs -- a short list of former patients includes, Keith Urban, Chevy Chase, Elizabeth Taylor, Gary Busey, Johnny Cash, Kelsey Grammer, David Hasselhoff, Mickey Mantle, Liza Minnelli, Ozzy Osbourne, and Anna Nicole Smith.