from www.tmz.com – Lindsay Lohan was arrested for leaving the scene of an accident this morning after allegedly clipping a pedestrian in downtown Manhattan … TMZ has learned.

Law enforcement sources tell TMZ, Lindsay was pulling in to park her Porsche Cayenne near the Dream Hotel in downtown NYC when — at a very low speed — she allegedly hit the knee of a 30-something year old guy. That was around 2AM ET.

We’re told one of Lindsay’s passengers in the SUV got out and checked the car for damage … and then LiLo and co. went inside the hotel.

We’re told someone called police while Lindsay was inside … and when she walked out of the hotel — around 2:30AM ET — officers arrested her.

According to our sources … Lindsay was booked for leaving the scene of an accident — a misdemeanor — and then released with a desk appearance ticket … meaning she did not have to pay bail before release.

We’re told alcohol was not involved.

We’re told the alleged victim was actually hospitalized … however, he was not knocked down or dragged … and didn’t have any visible injuries.

This arrest could absolutely trigger a probation violation in Lindsay’s jewelry theft case because one of the conditions of probation is she OBEY ALL LAWS.

Even without a conviction, Judge Stephanie Sautner — the judge in the jewelry theft case — could haul Lindsay’s butt into court if there’s probable cause to believe she committed a crime.