Does anyone know the name of this book?

[Karla]

The book is about a girl from the middle east I think. She is a thief at night but in the daytime she's a princess. She is the daughter of a king and he doesn't want her. Her mom is a celebrity that after leaving her dad never got well again. And she meets this guy that is supposed to catch her as a thief but he doesn't know it's her. He meets her at a party I think. They end up together and she ends up stealing a very valuable jewel from her dad that he gave to her mom on their wedding I think the jewel is called the sun and the moon. Well thanks