Billie Eilish is keeping with tradition! The singer stepped out looking gorgeously gothic-glam for Monday's Met Gala in New York City, where she snagged one particularly perfect memento. In a photo shared to her Instagram Story on Tuesday, Eilish snapped a quintessential, star-studded bathroom selfie from the event. In the image, Eilish appears to be laughing while flanked by Halle Bailey, Maya Hawke and Elle Fanning.