Credit: Photo via Instagram

Kim Zolciak took a break from posting pictures of her new babies on Instagram and decided to post an image of her older babies instead! The former Real Housewives of Atlanta cast member and current Don't Be Tardy star recently went on the popular photo-sharing site to repost a pic of her oldest daughter, Brielle, 17, giving her oldest son, KJ, 2, a kiss.

Credit: Brielle Biermann on Instagram

Kim wrote, "#repost @briellebiermann how cute swimming in the pool this morning!!! #enjoy4seasonsin4days."

When Brielle posted the original picture, she had written, "my best friend KJ." So cute!

We are so impressed with the way Brielle has embraced her role as big sister. She really is such an amazing sis to her brothers and little Kaia Rose. Most teenagers wouldn't have time to hang out with the kid brother on a warm, pool-worthy day, but Brielle actually loves spending time with her younger siblings. She even called KJ her bestie!

Meanwhile, we're dying of jealousy here over the fact that Brielle is hanging in her pool in a bikini! We thought that Atlanta was getting the cold weather and snow like the rest of us, but apparently the unseasonal temps didn't last very long in the southern state. We're sure Kim and Kroy's fancy pool is heated, but obviously it's warm enough for Brielle to wear a two-piece.

Sigh, Kim's life is so amazing.

Are you surprised that Brielle is such an awesome big sister to her little brother, KJ? Share your thoughts in the comments section below!