Eilish grew up a huge fan of aughts pop artists, such as Lana Del Rey and Avril Lavigne. One of her biggest celebrities of her childhood was none other than Justin Bieber, so you can bet that she was jazzed when they collaborated together on a remix of "Bad Guy." The day the single dropped, she wrote on Instagram, "BAD GUY FEAT. JUSTIN BIEBER OUT NOWWW OMGFFFFGGG ANYTHING IS POSSIBLE MAN."