Uh-oh. We love Katy Perry so this does pain us somewhat, but the singer had a major fashion fail in a full-on floral cape and dress at The Night That Changed America: A Grammy Salute To The Beatles held at the Los Angeles Convention Centre on Monday.
The singer attended the star-studded bash with her beau, John Mayer, and both stars entertained the crowds separately, with John teaming up for a performance with Keith Urban.
However, nothing managed to distract from Katy's disastrous dress, which looked like a curtain nightmare from the 50s. Even though the ensemble was actually by Dolce & Gabbana.
Katy paired the look with white stilettos and a short-fringed updo, neither of which managed to redeem it.
The Beatles tribute bash guest list read like a who's who of Hollywood, and attendees included Sean Penn, Johnny Depp, Tom Hanks and, of course, Sir Paul McCartney.
See more Katy Perry fashion highs and lows below: