7. Teacup Persian
These cats are not separated from Persians, as there are no special classifiers for that, like size or color. But, I must mention that Teacups are somewhat smaller than usual Persians.
Anyway, I decided to include them into my list for they are not easy to get, and the price may be stiff to pay. What makes them popular and prominent is shortened muzzle and long fur.
Teacup Persians are of modest and undemanding disposition. They are very playful and funny and look like fluffy balls. Anyway, they deserve to be the most popular cat breed in the United States.