Bret Michaels -- Having Nothin' But A Good Time ... Fresh Out of Surgery

Bret Michaels is back on stage, and somehow lovin' it ... just 2 days after going under the knife to have 2 stents ripped out of his body.

If Bret was in pain, he masked it well while he performed in Jacksonville Thursday night. Pretty amazing ... the guy's been in and out of 6 different hospitals over the last couple weeks to deal with complications from his diabetes.

Normally, stent removal is incredibly debilitating ... it can take several weeks to recover.

But Brett's pure bad ass. He's got 6 more shows over the next 2 weeks.