"Aren't you supposed to be in rehab now?" David Letterman didn't waste any time getting to the real questions when Lindsay Lohan appeared as a guest on the 'Late Show' Tuesday.

Lohan was evasive when Letterman asked how many times she's been in rehab in the past, and only offered a vague answer when asked, "How will this time be different?"

Take a look at the video below, and If you missed Oprah's interview with David Letterman in which he discussed his sexual transgressions, check that out here.

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