Rob and Kristen. Joanne and Paul.

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Ok, for the younglings in the fandom, the other couple is Joanne Woodward and her husband, Paul Newman. 
The two were married in 1958 after they worked together in the film The Long, Hot Summer. They remained happily married until his death in 2008.  Yep, 50 sweet and loving years.

And for the much, much younger fans. Paul Newman voiced Doc Hudson in Pixar's 'Cars'.

Aww... Love this comparison!
CalliopeBlabs Thanks to garnance for the heads up.