What to read after Natural Born Angel?

In a world where guardian angels are celebrities who save people for money, Maddy's life was transformed when she became the girlfriend of the hottest Angel around. But she never imagined that she'd become even more famous than Jackson. Unfortunately for Maddy, she's an irresistible PR opportunity - and soon her popularity soars higher than any Angel. Her relationship is cracking under the pressure. And as tension starts to mount between Angels and humans, she finds herself an ambassador for humankind. With Jackson at the helm of the Immortals, the two ex-lovers must become sworn enemies. It's Angels in one corner, humans on the other - until an evil force, greater than anything on Earth, forces them to stand united if they want to survive.