After surprising fans with a special float appearance at the Sydney Gay and Lesbian Mardi Gras parade on Saturday night, Sam Smith continued to enjoy the celebrations at the festivals official after party.

Fans had been expecting a mind-blowing performance, and the 27-year-old musician certainly delivered on that promise, appearing on stage at Hordern Pavilion in a giant red dress.

The show-stopping outfit featured the word equality sprawled across it, while Sam belted out the high notes to popular hit, Promises.