AceShowbiz - Kid Rock has launched a bitter attack against ticket scalpers trying to profit from his upcoming 40th birthday party show in his native Detroit, Michigan after the concert sold out within 19 minutes of going on sale. The "All Summer Long" hitmaker announced plans to celebrate the milestone age with fans at a special January 15, 2011 gig at Ford Field, which is to be renamed 40 Field for the night.

The show, which takes place two days before his actual birthday, will kick off his 2011 Born Free Tour, but it's already gotten off to a bad start - more than 45,000 tickets were snapped up last week and Rock has since learned a heap of stubs are being traded online at hugely inflated prices. The discovery has left Rock fuming because he works hard to try and keep ticket prices as low as possible so fans of all backgrounds have the opportunity to see him perform live.

But he has no idea how to combat the increasing popularity of secondary ticket brokers and the controversial practice has infuriated him. Taking to his website, an angry Rock writes, "IF I COULD CONFRONT EACH AND EVERY ONE OF THEM (ticket scalpers) FACE TO FACE I WOULD AND IT WOULD NOT WORK OUT TOO WELL FOR THEM I GUARANTEE ALL OF YOU. I hate them, I feel like someone is beating up a close friend or family member while I'm chained to a chair."