Bristol Palin, the 18-year-old daughter of former republican vice-presidential candidate Sarah Palin, has given birth to a son, Tripp Easton Mitchell Johnston. Bristol, who’s teenage pregnancy was almost as famous as Tina Fey‘s impression of her mother, gave birth on Sunday in Palmer, Alaska. The healthy baby weighed in at 7 lb.s, 4 oz.

"We think it’s wonderful," said Colleen Jones, the sister of Bristol’s grandmother Sally Heath, who confirmed the news. "The baby is fine and Bristol is doing well. Everyone is excited."

The baby’s father and Bristol’s fiance, Levi Johnston, is an apprentice electrician and former Wasilla High School hockey player. He and Bristol have been dating for three years and became engaged earlier this year. The couple plans to wed in 2009 and raise their child together.

Bristol is the oldest of Sarah and Todd Palin‘s three daughters (The couple also have two sons). When news of her pregnancy hit last summer, shortly after John McCain picked Governor Palin to be his running mate, the Palins said their daughter "came to us with news that we as parents knew would make her grow up faster than we’d ever planned."

They added Bristol "has our unconditional love and support."

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