The 21-year-old model discussed her love of photography on Tuesday's episode of the NBC late-night talk show before snapping pictures of Fallon in a Vogue-inspired pose.
"I've been shooting with Love magazine a lot," Jenner said of her recent covers featuring Sienna Miller and Kaia Gerber. "I used to just shoot my friends. I love, like, capturing a moment or being very candid and just, like, capturing all my friends and hanging out."
"I think it's a lot more authentic to capture a photo just on film and I have a whole folder on my phone of just, like, the sickest photos," she added.
Fallon struck a pose on his desk before recreating a shot in the March issue of Vogue of Jenner standing on a horse. Gerber, the 15-year-old daughter of supermodel Cindy Crawford, had said last year in Love that working with Jenner was "effortless."
"It just felt like two friends hanging out, snapping a few photos at candid moments," she said. "Kendall told me that my mom is one of the people she looks up to most, and it's cool to see it come full circle because Kendall is that role model for me."
Jenner came to fame with her family on the E! series Keeping Up with the Kardashians, and has since modeled for Balmain, Chanel and Victoria's Secret. She told Fallon she purposely ignores the audience, including her family, during fashion shows.
"I never look at the audience, ever. No one. If I do, it'll mess up," the star explained. "Kylie, sometimes, if she's at the show, her and my mom usually, I can hear them screaming. Sometimes I'll smirk a little bit, but I can never look."