Before performing at the official Sydney Gay and Lesbian Mardi Gras after party, Sam Smith took the time to make a glittery appearance at the parade on Saturday night.

The 27-year-old musician surprised members of LGBTQ organisation, Twenty10 when they joined their float that made its way down Oxford Street.

Wearing a bold green patterned jacket over a laced top, Sam danced along while waving to spectators and posing for photographs.