Lindsay Lohan is taking rehab really seriously this time, you guys. So seriously, in fact, that she made sure she went to Coachella first -- and so seriously that she won't stay if they don't let her take Adderall while she's there.

Lilo was spotted at the Indio, Calif. hipster mecca with her 16-year-old brother, Cody, and 19-year-old sister, Ali.

It's unclear if that was a way of keeping herself sober, since the sibs aren't legal drinking age, or merely a ruse so fewer people would suspect she's getting slizzered.

A source told E! Online that Lohan plans on having a "healthy fun time" at the festival, which is typically a hotbed for booze and drugs.

Meanwhile, while Lohan is gearing up for her latest in a countless number of stints in rehab, she's making demands: she either gets her Adderall or she gets the eff out.

TMZ reports that Lohan has every intention of leaving the Seafield Center in Westhampton Beach, N.Y., where she's slated to get clean, if they try taking her Adderall away from her.

And lo and behold, that's exactly the facility plans on doing.

Seafield reportedly tries weaning its clients off of Adderall using less addictive substitutes, which is the antithesis of what Lohan wants. Lohan insists she's tried other meds but that Adderall is the only one that works for her -- and that she needs it to function. Lohan swears if they try taking her Addies away, she's bailing.

And that, kids, is what you call "addiction." And jail time.

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