Kendall Jenner wouldn’t let any of her former partners appear on ‘Keeping Up with the Kardashians’ until they’d been together for “at least a year”

Farnaz Farjam said: "Kendall's always had this rule - she felt like she had to be with someone for at least a year before she let them be a part of the show, because she doesn't always know what people's intentions are. So that's why we kind of kept her personal life out of it, just because she had a rule."

Kendall’s younger sister Kylie Jenner, 23, also took a step back from the show in recent years, and although her romance with her ex-boyfriend Tyga was shown on the series, her current partner Travis Scott – with whom she has three-year-old daughter Stormi – “didn’t really want to participate”.

Farnaz added to Bravo TV’s ‘The Daily Dish’ podcast: "I feel like Kylie became more participatory this last season towards the end, and Kendall has dipped in and out. But they were at an age ... like, if you think about when you're a young adult coming into adulthood, I think you sometimes care a lot more what the outside world has to say about you.

“[Kylie] did share her relationship with Tyga. We showed their relationship quite a bit on ‘Keeping Up’, and then Travis [Scott] didn't really want to participate."

Although none of Kendall’s romances made it to the E! show, she came close to reaching the milestone with her current boyfriend Devin Booker, as the couple celebrated their one-year anniversary over the weekend.

Marking the special occasion on social media, Kendall shared sweet photos of herself with Devin, 24, including one which showed them snuggling up together as they played with a dog, and another which saw them cuddle together whilst on what appeared to be a private plane.

On Devin’s account, the basketball star posted a trio of snaps from the pair's time together, one of which was captioned "365" and another "52", in relation to the number of days and weeks in a year.

The final image showed the sun setting by a waterfront outdoor dining area, and he captioned it with the number “1” alongside an orange heart emoji.