Billie Eilish's love for Justin Bieber is no secret, but in her new documentary,, the singer shares a behind-the-scenes look at her meteoric rise to success — including the moment she got to meet and share supportive messages with the performer she's idolized for years.The doc shows the beginnings of Eilish's infatuation with Bieber — in one scene, she shares a clip of her 12-year-old self worrying that her future loves will have to compete with her affection for Bieber.