Spotted entering the facility in West Hollywood, Lohan has already been visited by mother Dina, sister Ali and former lover Samanatha Ronson there.
What convinced her to go?
We're guessing new attorney Robert Shapiro, who was hired by Lindsay to either reduce or eliminate her jail sentence, had everything to do with it.
By pushing rehab immediately and having her check in voluntarily, Shapiro is likely hoping Judge Marsha Revel will show her leniency on Tuesday.
NOOOOOOO! Finally forced to face the consequences of her actions, Lindsay Lohan broke down in tears in court. But could this be a blessing in disguise for the star?
That's when Lindsay is due to surrender and begin her 90-day jail term - part of which is to involve a stay in rehab - for violating her probation terms.
Since she's being proactive in getting help, will Revel allow Lohan to stay in the sober house or send her straight to another facility rather than jail?
That's what her camp is surely hoping for. But we'll see, seeing as judge has seemed bent on making an example out of the recalcitrant star so far.
On the flip side, maybe imposing the stiff sentence was needed to get Lindsay's act in gear and convince her she needs help - which was the point. (thehollywoodgossip)