Story last updated at 12/31/2008 - 11:45 am
Bristol Palin, the 18-year-old daughter of Gov. Sarah Palin, gave birth to a son on Sunday in Palmer, according to media reports.
The baby, who weighs 7 pounds, 4 ounces, is named Tripp Easton Mitchell Johnston, taking the last name of his father, Levi Johnston.
"The baby is fine, and Bristol is doing well. Everyone is excited," Sarah Palin's aunt, Colleen Jones, told People Magazine.
Sarah Palin revealed she was going to be a grandmother during the presidential campaign, at which time she said her daughter and Johnston intend to marry.