Kim Kardashian showed off some major cleavage in the same bikini that her 16-year-old sister, Kylie Jenner, modeled on Instagram Credit: Courtesy Kim Kardashian

When in Miami... Kim Kardashian channeled her inner beach babe by sharing a photo of herself wearing the same black cutout bikini that her younger sister Kylie Jenner modeled in a series of earlier Instagram selfies on Wednesday, March 12. See more bikini pics of Kim here.

"Quick swim before the Dash party," the 33-year-old reality star captioned one pic of herself showing off her ample cleavage and toned abs in front of a mirror. The photo was taken in what appears to be the bathroom of the Versace Mansion, which features gold faucets and marble countertops -- plus what looks like several chairs and a table.

Alongside another photo, this one taken from the side to show her famous butt, the future Mrs. Kanye West wrote, "Yep, stole Kylie's bikini...she's not getting it back."

Jenner, 16, posed in the bikini in multiple pics on Instagram earlier on March 12. "Oh haaayyy," she captioned one black-and-white pic of herself wearing the suit and standing next to a fresco painting of a mostly naked man.

Tell Us: Who wore it better: Kylie or Kim?