Lindsay Lohan is finally finished with her probation -- and she's ready to party!

The "reformed" Hollywood party princess threw a big bash at the notoriously naughty Hollywood hotspot, Chateau Marmont, in honor of being released from probation for the first time -- in four years! -- on Thursday evening.

But is throwing a big LA bash really such a good idea, Linds?

A fellow partygoer told Life & Style mag that the event was rather "tame" and, "It was a private suite - the place was packed with people. It was so crowded, you could barely see anything."

Lilo didn't touch a sip of alcohol all night, according to the source, but she did change her outfit a whopping FIVE times!

"She first had on this white dress, then changed into a black top and jeans, but then she changed again into another dress. She came out like five times from the bedroom wearing something different each time," the partygoer revealed.

The shindig began at 9 pm, and celeb pals Kimberly Stewart, Nicky Hilton and Brandon Davis came out to support the redheaded stunner, and "around midnight, she started kicking people out that she didn't know."

Meanwhile things are also looking up for Lohan on the career front; she's gearing up to guest star on Glee as herself, and will also take on the role of Elizabeth Taylor in Lifetime's upcoming biopic, Liz and Dick.

Please stay out of trouble Linds!