After working 85 hours over just four days, Lindsay Lohan was reportedly treated for “exhaustion” last Friday (Jun 15) … but apparently, that didn’t stop her from partying until the wee hours of the morning at a Hollywood nightclub the next day.

The Hollywood starlet was spotted Saturday night at the upscale L.A. hotspot Chateau Marmomnt, where she hung out with some friends — fellow actresses Busy Phillips, Haylie Duff, Ashley Benson and a group of five men — after a day of shooting scenes for the Elizabeth Taylor biopic “Liz & Dick.”

An eyewitness told Us Weekly, “For someone so exhausted, it was shocking to see her out past 1 AM,” adding that Lindsay stayed until the club was almost empty.

But Lindsay’s rep Steve Honig says it’s not what it looks like … she was just having an innocent dinner with friends.

Setting the record straight, Honig later told US Weekly,, “Lindsay had been working the night shift the last 2 or 3 nights so it’s quite reasonable that she was up and having dinner at 1 am. She’s working a shift from 8 pm to 9 am. It takes her body a day or two to adjust back from that timing. At 7:30 am on Monday morning, she was in the car and on her way to the set by 8 am.”

Whatever Lindsay is doing, … let’s just hope she stays on the right track (and out of trouble)!

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