Here's what we know:
* She often styles her hair straight. She has been seen on various occasions with straight hair, indicating she might use heat styling to achieve this look.
* She has worn curls in some roles. Her character Janine Butcher in EastEnders has curly hair, but this could be achieved through styling products or extensions.
* There's no official confirmation. Brooks hasn't publicly stated whether her hair is naturally curly or not.
Therefore, it's impossible to say for sure if Charlie Brooks' hair is naturally curly. It's likely a combination of her natural hair texture and styling techniques.