Lauryn HillLauryn Hill

TMZ says:

Officials tell TMZ ... the former Fugees singer was booked into the Federal Correctional Institution in Danbury at 11:15 AM EST.

We're told the FCI is a "minimum security type facility" where inmates live in "barracks type" housing.

We're also told 38-year-old Hill will not be isolated in the facility -- and will be housed with the general population.