Kim Zolciaks Sons Birthday Amid Divorce Drama

took her focus from her bitter feud with her estranged husband in recent days to celebrate her oldest son KJ Biermann's 15th birthday.

The 48-year-old former star gushed about how proud she was of her son and his athletic prowess in a sweet Instagram post.

And on Sunday, she returned to sing her middle son Kash's praises in another post after he was named Defensive Lineman of the Year by Born to Compete.

Zolciak focused on her older sons' accomplishments just two weeks after she claimed in her bitter custody case that her children had been able to hear her estranged ex-husband Biermann .

In her post celebrating KJ's birthday, Zolciak shared a barrage of photos tracing his growth from her little boy into a high school football star.

'Happy Birthday to the most incredible son @kjbiermann I had no idea what was missing from my life until you arrived,' she began her caption.

'You changed me in ways I could never fully describe. ❤️ You taught me strength, compassion, patience, and what the mother-son bond truly means,' she continued. 'You are my heart walking outside of my body, and every day you amaze me.'

She praised him for giving her the 'biggest, best hugs,' and she said she was 'so proud of the young man you have become. 

'Your work ethic, dedication, discipline, and drive especially when it comes to football are truly admirable,' Zolciak gushed. 'Watching you pursue your goals with such determination inspires me. 

Late last month, Zolciak slammed Biermann in a declaration in their ongoing case for allegedly being neglectful to their four minor children, including by allegedly engaging in sexual sessions with multiple partners within their earshot; seen in November