Try Singing it. Just once. Really Loud:
(Wasn't that Awesome?)
Now, on to the list!
Alien invasion and other inconveniences by Brian Yansky. When a race of aliens quickly takes over the earth, leaving most people dead, high-schooler Jesse finds himself a slave to an inept alien leader--a situation that brightens as Jesse develops telepathic powers and attracts the attention of two beautiful girls.
The dangerous days of Daniel X by James Patterson and Michael Ledwidge. Fifteen-year-old Daniel has followed in his parents' footsteps as the Alien Hunter, exterminating beings on The List of Alien Outlaws on Terra Firma, but when he faces his first of the top ten outlaws, the very existence Earth and another planet are at stake.
First day on earth by Cecil Castellucci. A novel about the true meaning of being an alien in an equally alien world.
Stuck on Earth . On a secret mission to evaluate whether the human race should be annihilated, a space alien inhabits the body of a bullied fourteen-year-old boy.