They have a pretty good reason to reconcile ... Sam says they are expecting a baby girl at the end of the month, which would be their first child.
TMZ broke the story ... Hannah filed for divorce back in February. In her divorce docs, she said Sam was "guilty of inappropriate marital conduct" and "adultery." She asked the court for primary custody of their future child and alimony.
We've reached out to reps for both Sam and Hannah ... so far no word back.