With a just-chopped, fringe-free brunette bob and floor-length tuxedo gown, the British singer was almost unrecognisable when she arrived on the red carpet.
The Voice UK judge recently ditched her old stylist and hired fashion expert Cobbie Yates in his place.
"I ended up looking like a transvestite," she said of her old look. "I want to change my hair, change my style. I want to be allowed to grow."