Bristol Palin Joins Cast of 'Teen Mom OG' Bristol Palin has confirmed she will officially join the long-running MTV reality show Teen Mom OG. The 27-year-old daughter of former Alaska Governor Sarah Palin is a mother of three. Palin will be replacing former cast member Farrah Abraham, who left the show last season. Palin made headlines back in 2008 when she got pregnant with her first child, Tripp Easton Mitchell Johnston, at the age of 17. Since then, she and husband Dakota Meyer have had two more children — daughters Sailor Grace and Atlee Bay, ages 2 and 1, respectively. Even though Meyer filed for divorce this year, he and Palin still post family photos of each other on social media.