New York's newest reality-TV star came into the world Saturday amid the usual feuding among the Real Housewives of New York. Bethenny Frankel gave birth to her first child, a daughter called Bryn, a month early - and just in time for Mother's Day. But leave it to her frenemy Jill Zarin to muck up the blessed event. Zarin posted the following message Friday on her Facebook profile, long before any reports of the birth were confirmed: "Heard Bethenny had a baby boy ... so happy for her and son. So happy for them." Her message was not only dead wrong, but also about 24 hours early. A show insider says the news was not well-received: "Hundreds and hundreds of people were attacking Jill on Facebook, Twitter -- even on her own fan-page -- for announcing the birth of Bethenny's baby before she did. They were calling her a 'loudmouth,' and saying B was right - she did need to get a hobby!" Zarin ate plenty of crow on her Facebook page after learning the truth about the non-boy bundle of joy: "Yesterday [my daughter] read a tweet and blog that Bethenny gave birth," Jill posted on Saturday. "We were excited and congratulated her obviously prematurely. I should have waited until B announced it herself. Sorry." B didn't seem too bothered when she Tweeted on Mother's Day, however. "I can't express how happy I am & how beautiful, supportive & thoughtful u all are. Bryn is a tiny beautiful peanut. new chapter begins. thank you," she wrote. A month premature, Bryn weighed 4 pounds, 12 ounces at birth. She is the first child for Bethenny and her new husband, Jason Hoppy.