As we previously reported, Jack's daughter Carrie tracked the actor down after growing up with foster parents. Her biological mother gave Carrie up for adoption soon after she was born.
Jack had no idea she existed ... until earlier this month -- when Carrie found her way back to daddy at a concert in Boca Raton, Florida. The next day, Jack introduced her to the audience as his daughter.
Check out the footage -- but be warned ... someone may start cutting onions in your general vicinity.