Grizzly grandma!

Sarah Palin's son Track and his wife Britta welcomed a baby girl Sunday, a source confirms to Us Weekly.

A rep for the Palin family confirmed to Us in May that Track, 22, and his high school sweetheart, Britta, said "I do" in Hatcher Pass, Alaska. "Our families couldn't be happier," the bride and groom's families said in a joint statement. "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 his sister Bristol, Track has two sisters -- Willow, 16, and Piper, 10 -- and a 2-year-old brother, Trig.