Why'd they do it? Because why not? They actually were perfectly dressed for the moment. Katy was sporting purple hair like Kim was back then, and her outfit was about the same color, too. Miley was wearing black, just like Diana. Funny!
In the pics, each lady takes a turn grabbing the other's lady lump. Miley looks amused, Katy on the other hand...
This isn't the only crazyness that went down at the Grammys this year. Kanye West almost gave Beyonce and Jay Z heart attacks when he pretended to interrupt one winner's big moment. And Pharrell gave Taylor Swift some serious stink eye. Only in Hollywood!
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Gallery | Grammys 2015 Red Carpet Arrivals