Our Dark Stars by Audrey Grey and Krystal Wade
Synopsis (Goodreads): While she sleeps, the whole universe changes. Princess Talia Starchaser has it all. Wealth. Status. Adoring citizens. But on the eve of her eighteenth birthday, she’s forced to publicly betray her best friend, a companion mock she’s had since birth, setting events into motion that lead to the destruction of the humans, and the princess…