WATCH: Lorde On ‘Tonight Show Starring Jimmy Fallon’: “Royals” Singer Talks T. Swift & ‘Hunger Games: Mockingjay’ Theme Song Following Katy Perry, Diplo Twitter Beef – Performs “Yellow Flicker Beat"

Following that killer performance of her Hunger Games: Mockingjay – Part 1 theme song "Yellow Flicker Beat" at the 2014 American Music Awards, and that totally intensified Twitter beef with Katy Perry and Diplo, New Zealand artist Lorde dropped by the Tonight Show Starring Jimmy Fallon to discuss the track, her career and her newfound friendship with 1989 singer, Taylor Swift. And of course, she had to bring down the house with a performance of the aforementioned Hunger Games track.

Sitting down next to Fallon and The O'Reilly Factor host Bill O'Reilly, the "Royals" singer spoke with the former Saturday Night Live player about what it was like to put together the entire track listing for the new Jennifer Lawrence-led film, which she claims took a little over two months. So, not only is Lorde an incredible musician but she's also a rocking project manager at the young age of 18.

Take a look at a portion from the singer's interview with the Tonight Show host below:

And like we mentioned, the singer ended her NBC appearance with an awesome performance of the Hunger Games track. Check it out here:

Before heading on over to Fallon, Lorde took to Twitter to show her excitement. Actually, we think it was excitement. Honestly, it was hard to tell. So, YOU decide!

Hunger Games: Mockingjay – Part 1 is currently in theaters now! The album is available at iTunes.