Billie Eilish attended her very first Grammys on Sunday night. The 18-year-old, who made history as the youngest person to receive nominations in all four major categories, sported her signature green hair and a matching outfit as she arrived at the Staples Centre in LA. After waving to her adoring fans outside, Billie once again proved she's one of the coolest teenagers around as she struck a few poses for the cameras. In addition to her nominations for album of the year, record of the year, song of the year, and best new artist, Billie's album When We All Fall Asleep, Where Do We Go? is also up for best pop vocal album and best engineered non-classical album. Needless to say, it's going to be a big night for her. See more pictures of Billie at the Grammys ahead.