Singer performs new single on the show
The singer left little to the imagination as she promoted her new single Roar on the talent show wearing a tiny orange and black dress.
Katy – whose knickers were on display throughout her performance – topped off her fierce look with cute animal ears and a chunky gold necklace.
John Mayer‘s gorgeous 28-year-old girlfriend isn’t the only star to have flashed her smalls in recent weeks.
Myleene Klass‘ scanties were on show beneath her sexy see-through black gown at the Pride Of Britain Awards in London last week.
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