Taylor Swift and Lorde Duet on "Royals"

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Let the above video be a lesson to all Taylor Swift fans out there:

Maintain your awesomeness in concert... and be treated to a special guest appearance.

Earlier this week, Swift performed an unexpected duet with Nick Jonas on "Jealous," and she was back to her surprising ways on Monday evening in D.C.

Ready to see Swift perform "Royals" with her best friend, Lorde?!? Check out the above video now.

Swift, of course, has an endless number of friends in Hollywood. But Lorde may be her closest pal.

After Monday’s show, Lorde took to Twitter and wrote:

“I’m gonna talk more about the show when I see it in full tomorrow. Be prepared for live tweeting and/or a long reference-heavy tumblr post but seriously, @taylorswift13 is the leader of a great and beautiful galaxy that I’d live in forever.”

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Taylor Swift Biography

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Taylor Swift is the next big thing in country music. She hails from Pennsylvania and has a younger brother named Austin. Personally,... More »
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Taylor Swift Quotes

I think it's kind of fun to call out your ex-boyfriends. Like why do this if you're not gonna take the opportunity to always have the last word. It's so much fun.

Taylor Swift

I saw that documentary on Britney Spears, and I feel bad for her—she can't leave her house!

Taylor Swift