Musk is author of the contemporary fantasy novel BloodAngel, published in 2005 by the ROC imprint of Penguin Books. Her second book, Uninvited, was released in 2007, and is an unrelated work intended for young adult readers. A sequel to BloodAngel, Lord of Bones, was released in 2008. Musk is one of the first people to ever use a site like Pinterest to plan out a novel.
Through IVF, she later gave birth to twin boys, Griffin and Xavier, in 2004; followed by triplets Damian, Saxon, and Kai in 2006. On September 13, 2008, she announced that she was divorcing Musk. She later wrote an article for Marie Claire about their relationship. She claims to have been a "model ex-wife", on good terms with Musk's second wife, Talulah Riley. She currently lives in Bel Air, California, with their five sons.