Elite Music on Instagram: "✨ Did you know? Sierra Harris walked onto the AGT stage not knowing her entire life was about to change. When Katy Perry asked her to sing Firework, no one expected Sierra to deliver it with such power that Katy literally threw her mug in playful shock. The judges were stunned, the crowd went crazy, and Sierra stood there overwhelmed as praise poured in from every direction. 🔥🎤💙 In reality, Katy’s reaction was full of love, sarcasm, and pure respect — because Sierra