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Arnold Schwarzenegger and estranged wife Maria Shriver reunited at church in Santa Monica on Sunday morning.

Surprisingly, their interaction looked as sunny as the day itself -- both were smiling and talking, and they even walked off together at the end of the ceremony.

They were joined by their kids (son Christopher, 13, is pictured above.) The family is celebrating Maria Shriver's birthday.

And, we were practically shocked to see that Arnold even got a kiss! See the pic after the jump!