Looks like Fall Out Boy isn't the only one telling John Mayer to Beat It! Ha!
She was using him to get to Katy Kat! And her plan worked!
Much to everyone's surprise, the gorgeous Girls star is escorting KtP to the Grammys this weekend!
Allison broke the news to Anderson Cooper today. She revealed:
"I am going to the Grammys and Katy Perry is my date. She's the hottest date. She's a friend of mine and she's nominated as she should be. I can't wait to go. Obviously she's awesome. She's the best."
We bet John is pissed that his pants pepperoni won't be the tasty meat filling in their seXXXy lady sammich!
Sorry, bud! Maybe you can still watch the post-show fireworks from the corner of the bed, LOLz!
[Image via WENN.]