Rehab does a body good ... at least for Lindsay Lohan, who strapped on a one-piece bathing suit and flaunted around her 27-year-old physique in Miami today.
It's the first time Lindsay's really shown off her body since leaving court-ordered rehab back in July, stemming from a reckless driving conviction.
Lilo is in south Florida for Art Basel ... which is a huge international art show -- described as the premiere showcase for Modern and contemporary works of art.
For the record, it's 78 in Miami today ... in December.
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