The I Want Candy singer, whose big brother is Backstreet Boys star Nick Carter, claims he was beaten up by four guys after they took issue with the singer appearing in the New Kids' hometown.
Carter posted photos of his battered face and bruised knuckles on Instagram.com on Sunday, adding, "I think my knuckles might be broken, but that's what they get. People think I'm a pretty little white boy but no way. I think I won. I'm still standing."
He later tweeted: "I'm a 6th degree black belt in Muay Thai.. They lost."
And he isn't about to let a few bumps and bruises derail his After Party Tour, insisting he wouldn't pull out of his planned performance.
He tweeted, "And yes I'm still performing tonight."