Kim shared a carousel of photos with the simple caption "lakemaxxing" (maximum lake relaxation). The post featured everything from paddleboarding and outdoor family walks to cuddling with a fluffy golden retriever puppy.

In one photo, Kim poses on a paddleboard in a black bikini while Penelope sits beside her in a white swimsuit, flashing a signature peace sign. Another shot captures the duo riding in a golf cart alongside another child. Kim also included several scenic views of the lake and a sweet photo of herself hugging the puppy.

Although the reality star looked completely relaxed and happy in the photos, fans' attention instantly shifted to her niece. Many simply couldn't believe how grown-up 14-year-old Penelope looked:

• "Penelopeeee????" one follower marvels.

• "Beautiful Penelope!" writes another.

Many confessed they almost didn't recognize the teenager, while others predicted a bright future for Kourtney Kardashian's daughter in show business:

"Penelope is the next IT GIRL! I can already see it!"

Beach Chic and Relaxed Vibes

The post also highlighted Kim's effortless summer style. For paddleboarding, she opted for a classic black bikini, later swapping it for a sporty racing jacket, an oversized visor, and a black bandana for another outing near the water. Her long dark hair and minimal makeup perfectly completed this laid-back vacation look.