Caitlyn Jenner is sharing well-wishes for Khloé Kardashian‘s growing family. The 78-year-old former Olympian offered congratulations on Twitter after Khloe welcomed her second baby earlier this month via surrogacy with ex Tristan Thompson.

“Congratulations major @khloekardashian!” Caitlyn wrote. “I love you so much! You are such a strong woman. And what an amazing mother.”

A source recently told ET, “Khloé is so grateful to have been able to expand her family and is adjusting to being a mom of two.” The source added that Khloe “has been with the baby for a little while now.”

The source further noted that her and Tristan’s 4-year-old daughter, True, is “so thrilled to have a baby brother.”

“She is loving every moment about being a big sister and wants to be a ‘mini mommy’ to the baby,” the source said.

Khloé, 38, and Tristan, 31, announced that they were expecting their second child together in mid-July, however, a source told ET at the time that the former couple was not getting back together, following their split over Tristan’s paternity scandal.

“The two aren’t together and Khloé will have the baby full time,” the source shared, adding that “Khloé wants Tristan in both of the kids’ lives as much as he wants to be.”

Another source added, “Khloé and Tristan are not back together and have not spoken since December outside of co-parenting matters.”

The decision to have another child together came before Khloé learned that Tristan was expecting another baby with Maralee Nichols in December, a rep for the Good American founder confirmed to ET at the time.

Meanwhile, one of ET’s sources says that Khloé and Tristan “have long said they wanted True to have a sibling, and Khloe even told her family she’d do it without Tristan if she needed to.”

Khloé eventually decided against doing it sans Tristan. As she and the pro athlete “were on good terms, they decided to move forward with surrogacy near the end of last year,” the source said, adding that it was only after that decision was made that “Tristan was caught cheating.”

See more on the former couple in the video below.


Khloe Kardashian is ‘Grateful’ for Expanded Family, Source Says

Khloe Kardashian & Tristan Thompson’s Relationship Timeline

Khloe Kardashian No Longer Dating Private Investor: It ‘Fizzled Out’

Why Kim Kardashian and Pete Davidson Called It Quits

Khloe Kardashian and Tristan Thompson Welcome Baby No. 2 Via Surrogate