Jax, 40, is no longer following them on social media, but it's unclear whether he made the first move or whether they blocked him.
All three are still following Jax's wife Brittany Cartwright, 30.
Tom, 36, served as co-best man at Jax and Brittany's wedding on June 29 in Versailles, Kentucky, but it appears their friendship has hit a snag.
- 'Vanderpump Rules' Star Jax Taylor Regrets Having Tom Sandoval In His Wedding To Brittany Cartwright & Hints At Ongoing Tension Between Them
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- 'Vanderpump Rules' Star Tom Sandoval Reacts To Jax Taylor's Confession That He Regrets Having Him In His Wedding
Kristen was noticeably absent at Stassi's engagement party in July, and Stassi's mother Dayna confirmed their fallout when a fan asked her if there was tension.
"Yes, quite sad. But I didn’t really know all the particulars. So I was out of the loop for awhile. Don’t you worry, it’s like Lion King and the circle of life … each one of these girls will grow, change and come back to their original strong friendship bond that they’ve always had. Somethings just take time," Dayna wrote.
What do you think happened between Jax & his costars? Sound off in the comments below!