The band is best known for hits like Overload, Freak Like Me and Round-Round.
The noughties pop trio headlined the opening night of Siren.
Despite only running into its third year, Siren has already established itself as a summer calendar highlight for Bristol dance music fans.
The festival will continue tonight (August 2) with UB40 ft. Ali Campbell headlining the Summertime Live event.
Scroll through for 7 photos from last night’s incredible performance by Sugababes.