She opened up on last night's episode.

As we all know, the Kardashian/Jenner family are never shy about opening up. Hell, they've made an empire based on it with their numerous reality TV shows. However, Caitlyn Jenner got candid last night on I'm A Celebrity Get Me Out Of Here when she revealed why her children still call her 'dad'. Speaking to fellow contestants, Caitlyn said: "My kids all call me 'dad'. "Kendall asked me first and I said '[Call me] dad, I’m your dad and I’ll always be your dad till the day I die.'" Caitlyn further explained that while she's comfortable with them calling her 'dad', what really surprises her is how well they use pronouns.

The girls swap parenting stories during a lovely moment at the Creek ❤. #ImACeleb pic.twitter.com/IEZkxrmRB0

— I'm A Celebrity... (@imacelebrity) November 22, 2019

She went on: "But what they’re really good at which shocks me all the time is when they’re talking about me, 'My dad she…' and it’s tough to change the pronoun in the middle of it. Bruce raised them and Caitlyn is enjoying their life with them." The reality star also noted that her grandchildren have begun calling her an adorable name - Boom Boom. "They’ve come up with Boom Boom. It kinda stuck, it was easy for them to say," she said.