They'll both be performing at the VMAs, and now it's emerged that Lady Gaga and Katy Perry will be sitting together at the event too!
The awards are being held at the Brooklyn Barclays Centre, and the venue tweeted a picture of the seating plan showing that Gaga and Katy will be beside each other, with Fun sitting behind them.
Gaga will open the show with her first live performance of 'Applause'. Meanwhile, Katy will close the show with a new song from her upcoming album Prism.
It's been viewed over 20 million times already - here's the video for 'Applause': The MTV Video Music Awards air on Sunday, August 25th on MTV.