Rebecca was born in Nottingham, United Kingdom. Her father the Baron De Longueuil, a doctor and artist, is of English-Scottish, French-Canadian descent. Her great grandmother Ernestine was 1st cousin to the Queen Mother and grew up with the Queen Mother in Glamis Castle in Scotland. Thus, Rebecca and her siblings are third cousins of Elizabeth II. Her mother is from the Philippines and brought up three children Angela, Rachel and Rebecca in Nottingham where they trained locally in the arts. She works as a costume-maker and translator.