Lindsay Lohan -- All Smiles After Final Probation Meeting

Lindsay Lohan flashed an ear-to-ear grin after her final meeting with her probation officer last week in Santa Monica ... as can clearly be seen in this photo obtained by TMZ.

According to our sources, Lindsay was ecstatic at the end of the meeting -- because instead of usually setting the date of their next appointment, LiLo's probation officer told her they are all done.

Lindsay is on track to finish the last of her probation requirements this week before her final hearing with Judge Stephanie Sautner on Thursday