Is my cat's fur colour rare? and why isnt she fully grown yet?

http://img36.imageshack.us/gal.php?g=100...
is that fur colour rare because i havnt seen it on any other cats
oh and btw she is a cat even thought she looks like a kitten.shes nearly 2 years old but hasnt grown fully (i do feed her VERY well). if you know why please tell me that too
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