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Jeez, Linds, maybe you shouldn't stay out all night Tweeting about SamRo!

Lindsay Lohan was shooting a new ad campaign for her leggings line at Miraval Living, a luxury condo on Manhattan's Upper East Side, reports OK! Mag... but the call time was 10am and LiLo didn't show up until 8pm!

Good lord. On top of that, when Linds finally arrived she "complained about the camera crews and requested a 12-pack of Red Bull," says a source. The shoot finally wrapped at 2am.

Whaddya expect when LiLo is involved? Nothing starts or ends on time!