Bristol Palin, daughter of former Alaska governor and 2008 Republican vice-presidential candidate Sarah Palin, announced Thursday that she is pregnant for a second time.

"I'm announcing this news a lot sooner than I ever expected due to the constant trolls who have nothing better to talk about!!!" Palin, 24, wrote on the religious site Patheos.com.

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"I wanted you guys to be the first to know that I am pregnant ? I know this has been, and will be, a huge disappointment to my family, to my close friends, and to many of you. But please respect Tripp's and my privacy during this time," she said, referring to her 6-year-old son with former fiance Levi Johnston, "I do not want any lectures and I do not want any sympathy."

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She did not name the father. Last month she and her mother announced that her May 23 wedding to decorated Marine Dakota Meyer had been called off.