Katy Perry, 41, turns back the clock in iconic stage outfit she first wore 17 years ago... as new single flops

Fans have been stunned by Perry's career slide, with one commenting, 'People really have moved on from her? She was, NOT THAT LONG AGO, one of the biggest pop stars on earth.'

Perry's last single, Bandaids, briefly peaked at No. 101 on the Spotify global 200 before quickly vanishing, marking yet another flop for the former hitmaker

Perry had been slated to close out the festival on Saturday following Pitbull's set, but dangerous weather conditions prevented her from doing so.

'Sadly my set @WerchterBoutique tonight can't happen due to a government mandated cancellation because of the incoming inclement weather and crowd safety concerns,' she penned in the caption.

The Roar hitmaker said that she had been backstage getting ready for her show 'when this news was delivered and they gave me no choice.'

'I am just as unhappy as you are,' she continued, before adding that the situation 'is beyond my control' and the safety of attendees is the main priority. 

'I am sorry I can't change the weather, and even sorrier that all of us can't be together tonight.' 

Perry concluded her message to fans by expressing her disappointment that she cannot celebrate her return to the festival stage after her last appearance back in 2009. 

'I was even gonna wear the same outfit from that 2009 show again. I love you all, and please get home safe,' the singer wrote along with a sad face emoji.  

The last-minute cancellation of Perry's show was due to 'severe thunderstorms' that were predicted to hit the area.

The decision was to 'ensure that the exit of visitors proceeds in a safe and orderly manner, allowing everyone to return home calmly.

'The safety and health of everyone present is always our top priority.'