Whilst belting out her famous tunes, the skirt of the 45-year-old's skimpy metallic dress just fell down, only to expose her bare derriere!!
Unfortunately, Toni who didn't even realize her bum was exposed, turned her back to her fans and was shaking her now bare bum, as the crowd bursted into laughter and cheers.
Toni just kept singing though , until a guy on stage handed her his suit jacket to cover up.
Luckily, she was wearing a Unclad bodysuit.
