Maci Bookout is one proud mom! The Teen Mom OG star, 28, took to her Instagram account on May 18 to celebrate her eldest son, Bentley‘s, graduation from fifth grade. In the clip, Maci and Ben appeared to be cruising along in their car, with Maci angling her phone selfie-style towards herself and her 11-year-old. Bentley looked so much like his doting mom as the two beamed at the camera with a fun filter!