Caitlyn Jenner congratulated Khloe Kardashian's surrogate-born kid.

Caitlyn tweeted on August 5: "Congratulations major @khloekardashian"

Accompanied with news of Khloe's second kid. "Love you!" You're strong. What a wonderful mom! Added Caitlyn.

Khloe shares her son with Tristan Thompson, 31, her ex-boyfriend and the father of her 4-year-old daughter True.

A representative revealed on July 13 that Khloe and Tristan's surrogate pregnancy was imminent.

Khloe and Tristan had their second child a month before breaking up.

The reality star dumped the NBA player after realizing he cheated with Maralee Nichols.

Tristan officially apologized to Khloe when his paternity was revealed in January.

A source said Khloe is prioritizing her children over dating before the arrival of her kid.

Khloe hasn't said anything about the birth of her son on social media yet.