It's all out war in the wardrobe department as Rihanna takes on Lady Gaga and Katy Perry for the most jaw-dropping clobber.
In an exclusive chat with Rihanna, the US chart-topper revealed just how serious it is.
She said: "My worst nightmare would be a clash on the red carpet - so we all text each other before to make sure."
Just imagine turning up in identical raw meat frocks... Speaking at the launch of her new album, Loud - out in November - Riri confided: "We're all kind of fearless with fashion. So Katy and I speak all the time about what we're going to wear. And Gaga.
"One time we were going to the Met Ball, and Katy phoned me to check. We were like Oh My God, we were both going in this dress by Dolce and Gabbana with Marilyn Monroe's face all over it.
"She was like, 'You can't. I've had my nails done in mink and it matches the dress. I thought, seeing as she'd gone to all that effort, I'd let her wear it."
That's what mates are for...