Lindsay Lohan — Sober Coachella … Mission Accomplished

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Lindsay Lohan stuck to her guns this weekend at Coachella … telling our sources, she followed through on her promise NOT to take a sip of booze the entire weekend — AND WHY WOULD SHE LIE

Lindsay was out in Malibu earlier today when we asked if she stayed clean as a whistle at the booze-filled drug-infested music festival … and Lindsay said yes … not like crap would hit the fan if she said otherwise.

We also asked about her favorite act over the weekend … and what her favorite non-alcoholic drink is … here”s a hint: it”s totally clear and it”s not vodka.

Lindsay”s scheduled to kick off her 90-day rehab stint on May 2nd.