Caitlyn Jenner
Caitlyn Jenner has allegedly become difficult to work with following her gender transitionGetty

Caitlyn Jenner has allegedly become difficult to work with, following her gender transition.

According to a report in OK! Magazine, the transgender Olympian, formerly known as Bruce Jenner, is acting like a diva towards the crew of her upcoming docu-series, I Am Cait.

"For years I knew Bruce [Jenner] as a nice, humble, genuine guy, and now I know Caitlyn to be just the opposite," a source said. "She's a little rude and arrogant and very short-tempered."

"Ironically, those are all the qualities that Caitlyn couldn't stand in her ex-wife," the insider added.

"She's become difficult to work with, holding up production because she's obsessing over her face or her Twitter account," the source continued.

Meanwhile, during an interview with Access Hollywood, Caitlyn's mother Esther Jenner talked about her child's new identity.

"I was there last week, well actually, I got home a week and a half ago. And I met Caitlyn. She is... so much more at ease," she said.

"I still have to call him Bruce. His father and I named him that. It's going to be a struggle for me to get used to the change, but happily so... I'm very happy for him — or her," Esther added.

I Am Cait will air on 26 July at 8pm in the US and on 2 August at 9pm in the UK on E!