I Make My Own Fun by Hannah Beer

Everyone knows Marina, the A-list movie star. But very few know Marina, the absolute monster. Not that anyone would believe them - Marina's reputation is as flawless as her skin. She bullies her assistants? Lies. Will have anyone fired? Rumour. Leaks stories about her friends? Honestly, you people have too much time on your hands. Years at the top have proved that whatever Marina wants, she gets. But when she meets bartender Anna, Marina discovers something that can't be bought: Anna's affection. As Anna remains unmoved, Marina's advances become more desperate - and her obsession more dangerous.