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In this 2012 file photo, Bristol Palin attends the "Dancing with the Stars: All Stars" panel at the Disney ABC Television Critics Association session in Beverly Hills, California. Image Credit: TODD WILLIAMSON/INVISION/AP

Bristol Palin, the 25-year-old daughter of 2008 US Republican vice presidential nominee Sarah Palin, is a mother for the second time.

Palin, who launched an abstinence campaign after giving birth as an unwed teenage mother, posted on Instagram Thursday that she gave birth to a girl, Sailor Grace, on Wednesday.

“Our family couldn’t be more complete,” she wrote beneath a photo of her and her sleeping baby.

Palin has not publicly identified the father, but announced she was pregnant shortly after her engagement to Medal of Honor recipient Dakota Meyer was broken off last spring.

“I know this has been, and will be, a huge disappointment to my family, to my close friends, and to many of you,” she wrote on her blog when she announced her second pregnancy. She asked for privacy for her and her son, Tripp.

“I do not want any lectures and I do not want any sympathy,” she wrote.

On Thursday, Meyer tweeted: “Best Christmas present ever!! I couldn’t be more proud of this little blessing.”

Bristol Palin was 18 when her mother, then governor of Alaska, was selected by US Senator John McCain to be his running mate. Shortly after that, it was announced the teenager was pregnant with her first child. At the time, Sarah Palin said her daughter and the baby’s father would marry. They did not.

Bristol Palin later became a paid spokeswoman advocating abstinence and warning against teenage pregnancies. She also performed on Dancing with the Stars and had a short-lived cable TV show called Life’s a Tripp.