Bristol Palin Welcomes A Baby Girl

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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.

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My heart just doubled

A post shared by Bristol Palin (@bsmp2) on

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.