Billie Eilish is celebrating her return to the live stage. The 19-year-old superstar singer gave her first arena performance in more than a year on Saturday (Sept. 18) during the 2021 iHeartRadio Festival at Las Vegas’ T-Mobile Arena — and she couldn’t have been more excited. “It’s been a year-and-a-half, what the f—! Let’s do this s—, let’s have fun!” Eilish told the packed crowd. “Forget everything that’s s—ty in your life and just have fun and dance and jump around.”