My Superstar BFF

Sofia Vergara & Johnny Depp! Martha Stewart & Diddy! Meet the stars' party pals in their Twitter pics

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KATY & TAYLOR

The pop stars went in for a cuddle while in London, with Taylor Swift writing that her pal Katy Perry "really puts the 'fun' in 'Fundon.'" Swift had fun with Perry again, posting the same snuggly shot – but this time, altered with kitty icons from her iPhone's CatPaint app.