The NFL cheerleaders come closest although they are not very well paid. They used to all be volunteers but at some point the teams realized that they serve a function similar to employee in that they promote the sport.
If there are other cheerleaders who are paid I'm not aware of it but it certainly doesn't sound like anything you could make a living from. My guess is that there are some people on the periphery who make more money like the organizers or the people who run the organizations and squads. Or the people who run businesses that teach cheerleading, gymnastics, etc.
Cheerleading is considered to be a professional sport. It is usually made up of physical activities based on organized routines which practically make it a pro sport. However, it is widely debated upon whether it should be a pro sport.