The 17-year-old performed her breakout hit "Royals" wearing a black sequined gown in front of a huge glowing backdrop of her face before being joined by Disclosure on stage.
Lorde beat out other ladies in her category including Lady Gaga, Katy Perry, Pink and Janelle Monae, but made sure to give her competitors a shout out in her acceptance speech.
"Thank you to the strong, intelligent, inspiring women in this category," the New Zealand native said.
"I'm still so new to getting awards that my brain feels like it's exploding every time it happens, so forgive me," she explained.
The award-winning singer shared a selfie backstage before getting glammed for the Brits. "No hair, no makeup. Bring it, Brits," she Instagrammed.
After finding out she won, she couldn't contain her excitement on Twitter. "I JUST WON A BRIT I AM OUT THIS IS THE COOLEST THING EVER," Lorde Tweeted.
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Gallery | Lorde: Music Star