Levi Johnston Reacts to Bristol Palin and Baby Tripp’s Controversial PSA

Thursday on ET, Levi Johnston reacts to the new anti-teen pregnancy Public Service Announcement featuring Bristol Palin and their son Tripp!

"Every time I tried to put him on TV she'd flip out -- but it is nice to see him on there; he's happy and he's looking good," Levi tells our own Samantha Harris. "[Bristol is] sending out a good message."

Watch ET Thursday as Levi talks about his relationship with Bristol and the latest on their custody battle!