Caitlyn Jenner has finally spoken out about her newborn grandchild, just days after Kylie Jenner gave birth!

My daughter just had a daughter," wrote the star on Instagram this Monday, February 5.

"It's amazing to be by your side through this journey. She's SO beautiful already. Can't wait to watch her grow. Throwback to my baby, as a baby @kyliejenner," continued Caitlyn.

As Breaking Celebrity News readers know, Kylie, 20, gave birth to her first child with boyfriend Travis Scott this February 1. She revealed the news over Instagram, telling fans that her daughter was "beautiful and healthy."