Bristol Palin Welcomes A Baby Girl

This video is unavailable because we were unable to load a message from our sponsors.

If you are using ad-blocking software, please disable it and reload the page.

Bristol Palin just became a mom for the second time!

The 25-year-old reality star gave birth to her first daughter on Wednesday, according to a message she shared on Instagram.

WATCH: Bristol Palin Is Naming Her Baby Girl Sailor

"My sweet Sailor Grace was born yesterday," she wrote on Thursday. "Our family couldn't be more complete."

Sailor joins 6-year-old brother Tripp, Bristol's son with ex-fiance Levi Johnston.

Bristol has had the name for her baby girl picked out for at least a month. She posted an Instagram pic in November showing items she already embroidered with her unborn daughter's name.

WATCH: Bristol Palin Shows Off 5-Month Baby Bump

At the time, Palin joked that Kristin Cavallari ripped off her idea when she named her baby Saylor, despite the difference in spelling.