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At the last minute, Lindsay Lohan canceled an interview she had planned with The Today Show's Matt Lauer for Thursday morning.

Lauer addressed it at the end of the show's story on Lindsay (watch video above). Lauer seemed a bit miffed and mystified, but now it's become clear why Lohan pulled the plug: she had failed a urine test for alcohol.

We're guessing she didn't want to do an interview on how well she was doing with staying on the wagon when she knew it would come out that she'd flunked. Lohan submitted to the tests 2 weeks ago; they were negative for drugs.

NBC had asked to license significant amounts of photo and video on Lindsay from X17, but canceled the request at the last minute.

Lindsay must appear in court today at 10 AM PT. X17 will be live at the courthouse to bring you the most up-to-date news!