Kim Kardashian Steals Kylie Jenner's Bikini, Poses For Sexy Selfies

There's probably nothing that makes a new mom feel better than to fit into her 16-year-old sister's teeny bikini ...

Yup, Kim Kardashian, who welcomed her daughter North last June, posted some sexy bikini selfies on her Instagram account Wednesday, March 12, revealing that she borrowed her little sister Kylie's black two-piece.

"Quick swim before the Dash party!" the 33-year-old wrote along with the first photo, sharing another snapshot shortly after with the caption, "Yep stole Kylie's bikini...she's not getting it back."

Kylie rocked the cut-out bikini earlier in the day, posting photos of herself at the Versace Mansion, where her family is staying in Miami. The Kardashian clan is celebrating the grand opening of their new DASH boutique on Collins Avenue.

Obviously, the family that shares swimsuits, stays together.

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