'Girls' Night Out! Katy Perry’s Taking Allison Williams to the Grammys

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There's always next year, John Mayer.

Though Katy Perry has been spending loads of time with John since late 2012, don’t expect him to be on her arm at the Grammys — because it’s a Girls night out for this gal!

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The “Firework” chart-topper is taking Allison Williams as her date to the awards show this Sunday.

“I am going to the Grammys. Katy Perry is my date. She is the hottest date,” the Girls star recently told Anderson Cooper. “She’s a friend of mine, and she’s nominated, as she should be, and I can’t wait to go. She’s awesome. She’s the best.”

The pairing actually makes sense considering Allison’s boyfriend, Ricky Van Veen, is close pals with John. As Life & Style reported, Allison and Ricky just moved in together.

EXCLUSIVE: Girls star Allison Williams moves in with boyfriend

Days after John attended the Presidential Inauguration with Katy in January, he was spotted with Allison in NYC — and, naturally, rumors started that the pair may have been more than just friends. Throw that one down the rumor mill garbage shoot.

In November, Katy and Allison rarely left each others sides when they attended the Unicef Snowflake Ball in NYC.

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Well, it seems these two are certainly BFFs in the making! Now, what will they wear?

Are you shocked Katy’s not bringing John as her date? Sound off in comments!