Whether they're sharing hilarious pics on Instagram or telling the funniest jokes in interviews, it's always refreshing to see our favorite celebrities show their humorous side. However, a few of them have taken things a little too far and ended up sharing the most offensive jokes ever.

Just three months ago, fans were shocked to see Katy Perry throw major shade at Britney Spears during the 2017 Grammys. When she talked about her new hairstyle, she made fun of the pop star by suggesting she would cut off all her hair over a public breakdown.

“It’s the last color in the spectrum that I can do, I’ve done all of them and the only thing left to do is shave my head, which I’m really saving for a public breakdown. I’m down for that. I’m almost moments away from that, obviously… not to stir controversy,” she said.

It's no wonder why the "Chained to the Rhythm" singer was met with major backlash. After all, mental illness is a serious issue and it's never something to joke about.

Unfortunately, Katy isn't the only one who went way too far with her jokes. Stars like Bella Thorne and Cameron Dallas also learned the hard way that there's a fine line between being funny and being super disrespectful — especially when it comes to other stars.

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Click through the gallery to see all the times stars made super offensive jokes about other celebrities.