Jennifer Garner Ben Affleck Violet Karate

Ben Affleck and Jennifer Garner left baby boy Samuel and younger daughter Seraphina at home to watch Violet at an important karate belt promotion ceremony Friday.

Think V's a black belt now?

The newly-expanded family is set to celebrate Mother's Day this Sunday, no doubt. Wonder what Ben's got in store for his wifey, beyond THIS touching video tribute? (click here to watch)