Machine Gun Kelly Broken Sternum Delays Concert Dates

4/28/2017 1:33 PM PDT

Machine Gun Kelly's Broken Sternum Forces Concert Postponements

EXCLUSIVE

Machine Gun Kelly is down for the count with broken bones in his chest ... an injury he suffered while shooting a movie last week.

MGK's rep tells TMZ ... he has a contusion and hairline fracture of the sternum (breastbone), and that's why he's had to reschedule the first 3 stops on his tour. Kelly announced the postponements Thursday night on social media, but kept quiet about the injury.

As we reported ... Kelly struggled through a show last weekend in Florida, even walking off stage at one point. Although he finished the show, it was obvious he was in a ton of pain.

Bad timing for the rapper ... his new album, "Bloom," comes out next month ... however, the rep says he's expected to make a full recovery, and Kelly will make up the tour dates.

BTW, the movie he was filming is called "Captive State." We're guessing he'll use a stunt man for any reshoots.