5:45 PM PT -- A rep for Flavor tells TMZ, Liz was NOT treated for an OD. The rep says Liz was briefly treated for exhaustion at the hospital after being kept awake all night doing "Couples Therapy" stuff ... and producers are hyping it up for ratings.
The rep adds, "The claim of an overdose, or any involvement of drugs, could not be further from the truth."
Flavor Flav's fiancee -- who is starring with the rapper on this season's "Couples Therapy" -- was hospitalized today after ODing on painkillers ... TMZ has learned.
Sources connected with the show tell TMZ ... the fiancee, Liz Trujillo, is the mother of one of Flav's children. The two agreed to appear on the show together to work on their relationship.
A honcho on the show tells us ... the OD was accidental and not a suicide attempt. We're told she was "acting strange" and it became apparent "she took too many pills."
The 39-year-old woman was taken by ambulance to the hospital, where she remains although we're told she'll be released soon.