Little Darlings by Jacqueline Wilson
Sunset lives a life of luxury with her beautiful ex-model mum, her world-famous rock star dad and her two little celebrity siblings. But life on the red carpet is no compensation for parents who constantly argue, intensive scrutiny from the media, and and having no real friends. Destiny, on the other hand, is an only child living on a rundown estate with a sickly but devoted mum who constantly tells her that she's really the daughter of a famous rock star . . . When the two girls meet in unlikely circumstances, they are surprised to find in each other something they've been missing all their lives . . .