Jon and Kate Gosselin were supposed to hit the "Today" show together this morning to present a united front against accusations that Jon is nailin' another woman -- but someone chickened out.

Kate (and her hair) was left to defend her hubby's actions all by her lonesome -- which she only kinda sorta did. Kate also told Meredith Viera that she and Jon -- who both star on a reality show which documents every minute detail of their lives -- will deal with this situation in private.