Ben Affleck and Jennifer Garner have this whole co-parenting thing down pat! The divorced couple reunite as they attend a birthday party for one of Sam's pals. Ben and Jen are seen engaging in very cordial conversation following his revealing conversation on Good Morning America where he proclaimed getting divorced was his biggest regret. Ben's comments about Jennifer reportedly made her boyfriend John Miller very uncomfortable! A source reported, "John is empathetic to Ben's struggles with sobriety, but he worries about how Jennifer has once again become the focus".

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