The first episode of Caitlynn Jenner's new docuseries, I Am Cait, will feature cameos by her mother, Esther, and daughter, Kylie.

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Tomorrow night, the eight-episode series will begin, and ahead of the highly anticipated premiere, several spoilers have been leaked.

"Spoilers in this week’s edition of In Touch Magazine reveal that both Cailtyn’s daughter Kylie Jenner and her 89-year-old mom, Esther, will be making cameos on 'I Am Cait,'" Celebrity Dirty Laundry reported on Thursday. "During the docu-series, Caitlyn’s Mom Esther will discuss how she has come to terms with Caitlyn’s transition."

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According to the report, Esther was heard saying, “My first feeling was, I lost my son, but you know what? I’m gaining?”

Late on in the show, Jenner is seen talking to her youngest daughter, Kylie, who has had a rough time dealing with her father's transition into a woman.

"Caitlyn can be seen hugging it out with Kylie and tearfully confessing that she just 'wants her kids to be proud of her,'" the site revealed.

In a second spoiler report, via Yibada, it was revealed Kim Kardashian and Kanye West will also be seen during episode one. During one sneak peek, Jenner was seen joking around in her closet with Kardashian, who pointed out her mother, Kris Jenner, had similar taste in dresses.

I Am Cait premieres tomorrow night, July 26, at 9 p.m. on the E! Network.