On Friday, it was reported that "The Kardashians" star and her ex have welcomed their second child together, a baby boy, via surrogate.
Khloe, 38, and Tristan, 31, have had an on-again-off-again relationship since 2016, and share 4-year-old daughter True Thompson.
The reality star gave the Good American founder a shoutout on social media following her exciting news, congratulating Khloe on both Twitter and her Instagram Story.
Alongside an article about Khloe and Tristan welcoming baby No. 2, Caitlyn, 72, tweeted, "Congratulations major @khloekardashian I love you so much!
Last month, TMZ broke the news that the former couple was expecting their second child via surrogate.
"We can confirm True will have a sibling who was conceived in November," a rep for Khloe told the E! News.
"Khloe and Tristan are not back together and have not spoken since December outside of co-parenting matters," a source said to E! News.