Do the shannon twins karissa and kristina get a natural tan or do they spray tan?

I see both Karissa and Kristina both get a tan..but I cannot tell if their tans are natural. Most people say if a person has a real tan than it's mostly brown not orange..and I see the shannon twins when they get a tan in like the summer they are both olive or light brown..not orange. Are their tans somewhat natural? Because I heard they are both italian..and don't italians get pretty dark naturally?