Kevin Costner, Christine Bomgarter Cap, gown and cold shoulder

Reunion exes for son's graduation !!!

Kevin Costner and Christine Bomgarters joined under a roof again - but could not turn it, they kept their distance. The Region? His son's graduation, not a harmony.

Expressive image

Piep PICS-Exes banned the drama for his 18-year-old son Keden's Big High School graduation in Santa Barbara ... but he ensured his distance.

Kevin and Christine each gave their moment to Kayeden - from the opposite end of the school ground. Kishore kept the things from Switzerland, both slammed the pics with proud parents.

 Yes, the stress is still there - no one is wrong ... especially with Christine is still cashing on those costner checks. Remember, Kev handed over a lump sum of $ 1 mile according to her pregnancy and still dropped $ 63K per month for children.

But while the drama could still be in the session ... at least they kept it away from the campus for a big day of Keden.