Ben Affleck as Batman

Although Ben Affleck and Jennifer Garner’s marriage is a wrap, Ben is there for his children.

With Batman v Superman coming, the actor reportedly borrowed the costume for son Samuel’s fourth birthday party.

In an interview with Extra, ex-wife Garner called it the “best dad moment ever.” “We all dressed up,” she said. “I dressed up as a ninja and Ben dressed up as Batman for Sam.”

Garner goes on to say her son is “kind of is losing it” over the fact that his dad will play Batman in the upcoming… sure to be blockbuster. “It’s really sweet,” she added.

Batman v Superman drops March 25.