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Josh Hartnett says his stomach scare -- which sent him to the hospital last month -- wasn't a big deal.

"I'm fine, I had a stomach bug -- it was literally, like, a 24 hour thing," the actor, 30, said at the Sixth Annual New Yorkers for Children Spring Dinner Dance Wednesday night.

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"I was so dehydrated that I needed to be on a couple of IVs. I'm good," he continued.

Hartnett was rushed to Cedars-Sinai Medical Center in L.A. at 1:45 a.m. from celebrity hot spot Cheateau Marmont, but his rep told Us then it was a "flare up" of an ongoing gastrointestinal problem that also plagued him while starring in the London stage version of Rain Man.

"[Media] made a huge deal about it because I left the Chateau Marmont -- you know," he said, naming the same hotel Lindsay Lohan got into her famous feud with Samantha Ronson's family. "That's where I always stay in L.A....you know, they wanna' come up with whatever they want to come up with."

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Hartnett says his stomach has been bothering him "for months. It's been recurring because I've spent a lot of time in third world countries and I drink the water occasionally when I shouldn't, I shower and -- [it's] nothing to worry about!

"I'll be around for awhile," he joked.

Since his brief hospitalization, the actor has been spotted partying at Miami club Florida Room and Lit in NYC.