Getty / Instagram @kimkardashian Composite

Kim Kardashian just had an epic reunion with Britney Spears ... and Khloé Kardashian joined, too!

Check out the pics Kim posted on her Instagram Story Friday night -- the trio got together for what appears to be a pajama party along with Brit's longtime manager, Cade Hudson . Instagram / @kimkardashian

They posed for 2 selfies together, with the first showing the "Toxic" singer sticking out her tongue as Kim posed with a duck face and peace sign. Instagram / @kimkardashian

They all looked just as blissfully care-free in the second snap, which had Khloé -- dressed in winter-themed pajamas -- taking her turn giving the camera a cheeky tongue-out grin. Getty

As you know, Kim and Britney go way back ... first clicki

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