Jimmy Buffett was hospitalized after falling off the stage during a concert in Australia Tuesday night.  It was a nasty fall, but apparently he's OK.

Jimmy was in the middle of singing when he suddenly fell.  There was a gap in-between the stage and the crowd and he dropped into it, hitting his head.  He lay on the ground for five to 10 minutes before paramedics helped him up. Read more and see the video on the next page.

It's unclear what caused Jimmy to fall . . . but a source tells TMZ that there were some bright, flashing stage lights that may have temporarily blinded him.

(TMZ has video of the fall.  You can't see much . . . but you can see him fall, and the security guys swarm in to assist him.  Check it out, here.)

Jimmy was then taken to the hospital, where he was listed in stable condition.

His rep released this statement:  "The doctors say he is doing well and will be released tomorrow.  More info as we get it, and thank you for all of your well-wishes!"  And as expected, he was released yesterday.

He's next scheduled to perform this Saturday in New Zealand.  As of late last night, it was unclear whether he'd be able to make it.