Jennings is the subject of the "I Am Jazz" FTA series, which has related her life as a transgender girl. The series is scheduled to return for the fifth season in January and viewers will see their surgery in the air.
"This is really the last thing that will validate my identity as a woman," Jennings said during his interview. "There's nothing more after this."
The 18-year-old said she realized from the beginning that she was in the wrong body and reiterated it during her interview with ABC.
"When I was 2 years old, I went up to my mother and asked her:" When will the good fairy come with her magic wand and change my penis for a vagina? ", Jennings recalled.
Jennings has undergone hormone therapy for years to help her in her transition and said there was a complication after her surgery.
"I had to go back for another procedure, but it was only part of the trip," he said. "The good thing, though, is that it was only cosmetic and external, so it was not too dramatic."
Jennings does well and said the surgery was the final step for her to become her true self.
"I can only be myself, be in the body I've always wanted," he said. "And then I can live my life just like Jazz."