The Roar singer held her "Birthday" bash from the Newcastle Metro Radio Arena during the awards ceremony, which happened live from the MGM Grand Garden Arena in Las Vegas.
Donning a green-colored do, Perry invited a surprised fan who was celebrating her birthday to join her onstage. Channeling Peter Pan, Perry then flew away from the cake and backup dancers on the arena's platform, riding a zipline over the audience in a bunch of balloons reminiscent of the Pixar film, Up.
Birthday is the latest single from Perry's third studio album PRISM. Debuting at No. 1 when it was released in October, the single moved up four spots to No. 25 on this week's Hot 100 chart. Other PRISM singles, Roar and Dark Horse -- have already hit the No. 1 spot.
— PopCrush (@PopCrush) May 19, 2014
— MTV Asia (@mtvasia) May 19, 2014
Another unlikely performer was Michael Jackson, or rather, a hologram of the King of Pop.
— BBC Newsbeat (@BBCNewsbeat) May 19, 2014
— Daily Star (@Daily_Star) May 19, 2014
The controversial use of Jackson's likeness was battled out in court, but a federal judge allowed the Billboard Music Awards to go ahead with its plans to use the hologram during the awards show.
Perry was just one of the many stunning performances at the 2014 Billboard Music Awards. Shakira, Florida Georgia Line, Ariana Grande, 5 Seconds of Summer, and Iggy Azalea each took a turn wowing the audience.
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— Justin Timberlake (@jtimberlake) May 19, 2014
Timberlake's humor came out backstage when he posted a little celebratory dance:
Image via YouTube