Pearl Sinclair

From Muppet Wiki

Pearl Sinclair is Earl's younger sister, who dropped by in the fourth season Dinosaurs episode "Earl and Pearl." Pearl is a successful country singer, having set out on her own not long before the death of their father, some 18 years ago, leaving Earl to quit school and work to support their mother. Earl resents his sister for running out on the family, and for having a life of freedom and the thrill of performing.