Question about cellulite?? help?

ok, i personally dont have cellulite, im 5'2 119 pounds and pretty active. i play soccer and go to the gym regularly and try to be good about what i eat. by any means i am NOT thin, and i would deff. love to loose some weight, but h/o let me get to my question. one of my bestfriends is really thin, completly unathletic, eats poorly (like boxes of cookies a day) doesnt have fat on her body, but has cellulite all on the backside of her legs. how is she skinny with cellulite..i thought it was made of fat. also, does eating poorly have to do with cellulite? i mean, i have much more fat on my body then my friend so im baffled lol. sorry this is long and possibly confusing , i just want to know.