We all know celebrities get a lot of abuse online and now we can see how they react when they read harsh things about themselves...
In a section called 'Mean Tweets' on 'Jimmy Kimmel Live', Katy Perry, Selenea Gomez, John Legend, Pharrell and more found out what some people really think about them.
Rapper Lil Wayne has to have the best reaction to his mean tweet, which was "Lil Wayne looks like a crabapple."
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"I don't know what a crabapple is," he replied.
Watch the hilarious video above.