Carrie Underwood, Vince Gill and Craig Morgan are the first three country stars to announce that they will take part in the 17th annual City of Hope Celebrity Softball Challenge, presented by the Gibson Foundation.

The shindig throws down on June 7 at 1 p.m. at Nashville's Greer Stadium. The event intends to raise money for the City of Hope Cancer Center, which performs research and treatment for cancer, diabetes and HIV/AIDS patients.

Stay tuned as the full list of participating stars should be announced soon.