Elizabeth Hanson, Britta's mother, told the site her granddaughter is "exquisite."
Track, 22, and Britta, 21, were high school sweethearts. They married three months ago in Hatcher Pass, Alaska. A rep for the Palin family told Us Weekly: "These are two hard working, humble, active, studious young adults who grew up together. We're tickled that after two decades of friendship we proudly witnessed their marriage, knowing their new life together will be blessed."
The former Vice Presidential candidate, 47, first became a grandmother in 2008 when Bristol, 20, gave birth to her son Tripp.
In addition to Track and Bristol, Sarah and her husband Todd, 46, are parents to Willow, 16, Piper, 10, and Trig, 2.