Katy Perry's live BRIT awards performance slammed on Twitter

Not again! It's increasingly evident that Katy Perry should avoid singing live…

Her pitchy BRITs performance of 'Dark Horse' hit a sour note with Twitter followers, with one fan saying her singing was "shameful". Check out the video above!

Want to know what other critics said in the social media explosion? Check out the comments below.

And one that made us chuckle quietly to ourselves:

This kind of criticism isn't new for Katy, with the star bagged for her performance at the 2013 French Music Awards. Check out that video below.

Red carpet: The 2014 BRIT Awards