Pregnant Kim Kardashian Shows Off Her Baby Bump in a Bronze String Bikini: See Her Steamy Maternity Swim Style!

Pregnant Kim Kardashian worked a teeny, baby bump-baring bikini on the shores of St. Barts on Tuesday, Aug. 18; see her maternity swim style! Credit: BRIAN PRAHL SPLASH NEWS

Bronzed beauty! Pregnant Kim Kardashian, who's due with her second child (a son!) in December, took to the beaches of St. Barts on Tuesday, Aug. 18, to get her tan on.

In photos revealed exclusively in the new issue of Us Weekly, the reality superstar, 34, strolled onto the sand wearing a teensy, copper-hued triangle-top two-piece, which showcased her blossomed baby bump, ample bosom, and famous booty. Her ocean-dipped tresses were tousled and brushed back, and she modeled a light pink lip.

While in the Caribbean, Mrs. Kanye West, who stayed at a $25,000-per-week, nine-bedroom compound with her family (including sisters Kourtney and Khloe Kardashian, half-sisters Kendall and Kylie Jenner, and mom Kris Jenner). "The trip was all about bonding [with the family]," a source told Us Weekly. "Kim is a mom first." Commenting on the star's second pregnancy, the insider added, "She feels great, and she's relaxed."

And ready for a close-up at any moment! The Keeping Up With the Kardashians star carried her iPhone in hand and posed for selfies on the beach, using the crystal-clear water as her background.

While Kim has yet to share those selfies via her personal social media pages, she has posted plenty of snaps from her vacation, including one from a hike with Kris, which she captioned, "Morning hike last week in St. Barth's [sic] with my mamma." (Unable to help herself, she wrote beside her second shared shot: "Lighting so good, had me like….")

To see more snaps from Kim and the family's St. Barts vacation, including adorable pics of her daughter, North West, as well as niece Penelope and nephew Mason Disick, pick up the new issue of Us Weekly, on stands Wednesday!