Britney Spears Laughing It Up With K. Fed's Preggo Wife

3/10/2014 9:40 AM PDT

Britney Spears -- Laughing It Up with Kevin Federline's Pregnant Wife

Kevin Federline has his very own first wives club -- Britney Spears (wife #1) and Victoria Prince (wife #2) got on like a house on fire Sunday ... laughing and chatting at Britney's son's soccer game.

It was the ideal picture of divorce -- Kevin and Britney (who split in 2006) each took their significant others to their son Jayden's soccer game in L.A. Britney took her current boyfriend David Lucado ... and Kevin took his pregnant wife Victoria.

As we reported, even Kevin and David are pals.

Gotta hand it to Kev and Brit -- they've figured out post-divorce life in a way most people don't.