Justin Bieber is really good again, you guys.

While we're sure the entirety of the Ultra Music Festival in Miami was incredible, the closing set performed by Skrillex might have won the whole three-day affair. Performing his latest release "Where Are Ü Now," which features Diplo and the Biebs on the recorded version, the EDM artist surprised attendees when both artists also came out onstage to perform the hit to close out the concert series. Diplo and Skrillex make up the EDM duo Jack Ü.

The crowd went nuts when Bieber, who arrived after a variety of other surprise performances from Diddy, Ariana Grande, Usher and Kiesza, took the stage, singing, dancing and screaming as he belted out his emotional lyrics while providing some robotic-style dance moves. He also gave other concertgoers a big shock when he joined Grande onstage during her Honeymoon Tour performance in Miami Saturday night. But when it came time to sing his part of "Love Me Harder," which was originally performed by The Weeknd, he couldn't remember the lyrics!

"So I feel bad, I forgot the words, Ariana," he told Grande while performing inside the American Airlines arena. "I've been trying to memorize them backstage for like an hour!"

Justin Bieber, Ultra


But the "Bang Bang" singer took it in stride! Instead of getting mad, she kept performing with Bieber, including taking on his songs such as "As Long As You Love Me" and "All That Matters." The two must have had a great time together, as they had a love fest on Twitter afterwards.

"Thank you @ArianaGrande and thank you Miami," Bieber tweeted. "I missed the stage. See u soon ;)" Grande added, "Thank u Miami babes and thank u @JustinBieber!!!"

Her brother, Frankie Grande, also got in on the fun, but instead of tweeting his love for Justin and his sister, he recorded a video!

"Love you Justin. I love you Ariana," he said while traveling to the Kids' Choice Awards. "Why can't I be in two places at once?!"

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