It's Michael, bitch!!
UFC star Michael Chandler traded the gloves for a mic during his appearance on "The Masked Singer" national tour stop in Nashville on Wednesday ... belting out Britney Spears' "...Baby One More Time" -- and it's hilarious!!
Look, the dude ain't gonna win a Grammy anytime soon ... but it certainly looked like he had a blast -- shaking his hips and pulling off some dance moves that would make Brit proud.
Chandler's fam was present for the whole thing -- cheering him on as he made it through the 1999 hit.