Remee, who weighed 5lb 15oz, was blonde and fair skinned. Her sister Kian, born a minute later weighing 6lb, was black.
"It was a shock when I realised that my twins were two different colours," said Kylie, 19. "But it doesn't matter to us - they are just our two gorgeous little girls."
The amazing conception happened after two eggs were fertilised at the same time in the womb.
Both Kylie and her partner Remi Horder, 17, are of mixed race. Their mothers are both white and their fathers are black.
According to the Multiple Births Foundation, baby Kian must have inherited the black genes from both sides of the family, whilst Remee inherited the white ones.
The odds against of a mixed race couple having twins of dramatically different colour are a million to one.