Naturi Naughton will be working on set through Halloween this year, but she's warning new relationships to watch for the red flags ... if their partner isn't that open to a COUPLES COSTUME!!!

TMZ linked up with Naturi at the premiere of her and Lifetime's new flick, "Friends and Lovers," where the seasoned actress gave her two cents about trick-or-treating as a team. Instagram / @naturi4real

We totally asked the right person ... Naturi says Halloween is a big deal in her household -- and her daughter is totally PO'ed that she has to miss this year -- but her husband will hold down the fright night fort.

Naturi explains from her POV, seasoned couples are allowed to have grace and skip a Beggar's Night or Halloween party if they have several under their belts.

However, if they're sti

See Full Page