EXCLUSIVE

Last time we saw Farrah she was marching into the Vivid offices with her father and daughter in tow to talk dollars and cents with porn king Steve Hirsch -- who's been interested in buying the "Teen Mom"/James Deen XXX vid from the get-go.
Even though Farrah said she was considering other offers ... sources close to the situation tell TMZ, Farrah finally inked a deal with Vivid ... for close to a million dollars.
Yes, nearly ONE MILLION DOLLARS.
Not only that, we've learned the 70-minute-long skin flick will be titled: "Farrah Superstar: Backdoor Teen Mom."
Backdoor moms rule.