Christina Schwarzenegger

The Schwarzeneggers got the fam back together Monday night for some fine dining at celebrity favorite sushi spot ... Nobu! Check out the pics ... it was a whole family reunion with Arnold and his ex-wife Maria Shriver ... plus all of their kiddos -- Patrick Schwarzenegger and his wife Abby…

Arnold Schwarzenegger and Maria Shriver broke bread last night -- their second meal together in less than a week -- but this dinner date was about more than just a meal. Arnold and Maria went to Mastro's Steakhouse in Bev Hills with their kids ... Patrick, Christina, and Chris ... to celebrate…