BOWLED OVER Instagram / @jeremyloper
Chris Kirkpatrick of *NSYNC was totally Pete Rose'd in the middle of a celebrity softball game ... getting leveled at home plate and breaking his hand in the process -- but somehow, the dude kept playing through the injury!!
TMZ is told ... the musician was one of several big names invited to participate in the Rock 'N Jock fundraiser for Folds of Honor in Nashville on Monday -- and at one point in the friendly competition, CK proved just how tough boy bands can be!