Watch Lindsay Lohan Squirm Through Letterman's Questions About Rehab

In a clip released by CBS, David Letterman asks how many times Lindsay has been in rehab. "Several," she answers.

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Lindsay keeps it together, for the most part, but you can tell she's caught off-guard. "We didn't discuss this in the pre-interview," she says. Lindsay does go on to say she views rehab as a "blessing."