Jessie J flashes her underwear in sheer T-shirt dress as she performs in Barcelona for Sweet Talker world tour

Jessie J outdid herself on Thursday night as she took to the stage at Festival Jardins de Pedralbes in Barcelona, flashing her underwear at the crowd in a very sheer T-shirt dress.

The 27-year-old power house stunned her Spanish audience as she blasted them with her strong vocals.