EXCLUSIVE: Bindi Irwin Reveals 'Defining Moment' She Knew Chandler Powell Was the One in First Joint Interview

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Chandler Powell got his khakis!

Bindi Irwin and her 19-year-old boyfriend joined ET's Cameron Mathison at the Australia Zoo, where the 18-year-old wildlife conservationist shared a sweet story about the special moment when she first saw her beau donning the family garb.

"It's this really big thing for me," she adorably explained. "It was kind of one of those moments that was a real defining moment for me, because you know, it's only the people who are the closest to us that get their khakis."

WATCH: Bindi Irwin Is Proud of Boyfriend Chandler Powell's 'Croc Catching' -- 'I Feel Extremely Blessed'

"So it was kind of like, this really big step," Bindi added, telling her boyfriend, "I love seeing you in khaki now. It makes me so happy."

That is so unbelievably sweet!

EXCLUSIVE: Bindi Irwin Talks Life After 'Dancing With the Stars,' Calls Boyfriend Chandler Powell the 'Sunshine' in Her Life

And the very first place Chandler put on his khakis? Catching crocodiles with his girlfriend!

"The very first place you got to wear your khakis was on the croc trip," Bindi remembered. "It was a cool way to break in your khakis."

“Yeah, that was incredible," Chandler added. "Last month, we were up in far north Queensland on the Steve Irwin Wildlife Reserve, and we spent a whole month just catching crocodiles in the wild."

WATCH: Bindi Irwin Pays Tribute to Her Mom and Late Father While Celebrating 18th Birthday

Well, it seems like Bindi is making a real wildlife expert of her man!

Watch the video below to see Bindi make a promise to Cameron to teach him about zoo life.

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