Patricia Arquette -- Cheney's Daughter

Posted Aug 5th 2009 1:00AM by TMZ Staff

Here's "Medium" star Patricia Arquette at an event in L.A. on Tuesday (left) -- and Dick Cheney's daughter Mary Cheney as she appears on the cover of her memoir (right).



One of them has been in a committed long-term relationship with the same person since 1992.

We're just sayin'.

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