Lindsey Lohan was on "Letterman" last night . . . and during her interview, she and Dave prank called OPRAH WINFREY. Oprah is Lindsey's boss now, as Lindsay has a docu-series on OWN.

It wasn't much of a "prank call," but Dave did pretend to be Lindsay's secretary at first.  It's unclear how much of it was planned, but Oprah DID seem surprised.

Late Show with David Letterman
CBS
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