Kendall Jenner can hear her sister Kylie screaming her support when she's on the fashion runway.

The 21-year-old model - who has walked for a host of top brands, including Victoria's Secret and Chanel - has made a conscious effort to avoid eye contact with members of the audience, because she fears it could break her concentration.

She shared: ''I've told myself since my first show, like I never look at the audience, ever.

''No one. Like, if I do, it will mess me up. It's kind of like being on stage, I guess, if you're a theatre actor. It's like if you look at something just to take you out of your zone.''

But despite her best efforts to ignore the crowd, Kendall can still hear the supportive screams of her mother Kris and sister Kylie.

The brunette beauty told 'The Tonight Show Starring Jimmy Fallon': ''Kylie, sometimes if she's at a show, her and my mom usually, I can hear them screaming and sometimes I'll smirk a little bit because I can't hold it in. But I'll never look.''

And despite the pressure of starring on the runway, Kendall - who is currently in New York City for Fashion Week - revealed she loves her job.

She said: ''It's really fun ... you work all day and then people are like 'let's go out' there's no sleeping. The last three years have been awesome.''

Meanwhile, Kendall recently confessed she likes to wear sheer tops when she's having ''a good boob day''.

The model took to her website earlier this month to defend a picture of herself in which she wore a sheer top with no bra, and covered her nipples with pizza emojis.

She wrote on ''I don't know if you can relate, but I just felt like I was having a really good boob day, lol. Do you know what I mean? Your boobs go through phases and on this particular day, I felt like they just looked nice! (sic)''