Story highlights UK twins, one white and one black, have had to fight to prove they're sisters

"My family is beautiful," one sister posts on Facebook

(CNN) Here's a pair of twins no one will have trouble telling apart: One is white, and one is black.

Thanks to a rare quirk of nature, Lucy is the alabaster-skinned redhead, and Maria has their part-Jamaican mother's dark skin and hair.

Images of the Aylmer sisters of Gloucester, United Kingdom, rocketed around the Internet this week when a British newspaper carried their story.

"I can't stop crying! This is all so amazing," Lucy Aylmer posted on Facebook.

The girls were born to a white father and a biracial mom in 1997, according to the Daily Mail story that started all the fuss.