Brenna Marie Kerns (born May 22, 2006) is the youngest child of Shawn and Shannon, and younger sister to twins Bryce and Brandon.

In the Submission Reel, Brenna is shown being deliberately tripped by Bryce onto the pavement. During Observation, she picked up a piece of pizza that Brandon had spit onto the floor and ate it. Jo thought she was going to throw up when she saw Brenna do that. Brenna would also not stay in bed.

She was 2 on Supernanny. Now she is 12 years old in 2018.