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11 October 2013, 12:39
The stars take part in a special Twitter segment on Jimmy Kimmel's chat show.
Katy Perry and Pharrell Williams both star in a new video from the Jimmy Kimmel show where they read out offensive tweets about themselves.
The 'Firework' singer's boyfriend John Mayer also takes part in the segment.
Pharrell reads out a tweet which says he looks like "a sewer rat".
Lil Wayne, John Legend, Kid Rock and Ke$ha also take part in the hilarious clip.
Watch the video of all the stars reading out 'Mean Tweets' below:
Meanwhile, Katy Perry was confirmed to be performing at the MTV Europe Music Awards this week.
The US star will perform a new track from her latest album 'Prism' on the show.