"Dr. 90210" has a ton of fans ... at correctional facilities all over the country.
Yesterday in Beverly Hills, the good doc Robert Rey read us a letter from incarcerated supporter Rod -- who specifically asked for an 8x10in photo ... which he'll probably hang in his 8x10ft cell.
Dr. Rey -- Big in Prison
9/16/2009 2:41 PM PDT BY TMZ STAFF
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