Ben Affleck Jennifer's Got My Back

3/15/2017 9:47 AM PDT

Ben Affleck's support system is right in front of him ... literally.

Ben and Jennifer Garner were out Wednesday in Santa Monica just 1 day after Ben announced he completed rehab.

As we reported, their divorce is still full steam ahead ... but they are serious co-parents who not only get along ... they still support each other.