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One might expect that collapsing from exertion in unseasonable heat and being administered Vitamin B shots at one's favorite hospital would be enough excitement in a single day for a dangerously dehydrated starlet. But if the heat-stroker in question happens to be Lindsay Lohan, a little emergency room pit-stop is nothing more than a perfect happy hour tune-up for a night out on the town. Reports a reader who claims to have seen the actress last night and not been aware of her hospitalization earlier that day:

Was at Guy's on Beverly last night (7/25) for karaoke and saw Lindsay Lohan and Nicole Ritchie sharing Almost didn't recognize Lindsay at first because she was looking surprisingly healthy and normal. Nicole, however did not. My friend pointed out that she was skinnier than the Olsen Twin (does it even matter which one anymore?) who was also in attendance. I left early, but apparently later in the night Lindsay and Nicole (wearing someone's underwear over her pants) took the stage to sing something.

We welcome additional eyewitness accounts from other Guy's patrons to corroborate (or refute, as the case may be) this sighting—surely someone else out there witnessed the Lohan-Richie karaoke duet if it actually occurred. If for no other reason than the benefit it might one day provide to medical science, we'd love to know just how fast someone in their partying prime can bounce back from an ER oil change.

UPDATE: Looks like TMZ's cameraman caught Lohan leaving Guy's last night in one of their "celebrities entering and exiting drinking establishments" videos. We still want to hear any reports from inside the club, should you care to share that sort of personal brush with Lohanness with us.