6 Heartfelt & Revealing Moments From the 'I Am Cait' Premiere Episode

Caitlyn Jenner's highly anticipated docu-series I Am Cait follows the journey the former Keeping Up With the Kardashians star underwent while transitioning, and the way her family, friends and the public at large reacted to her.

While the show doesn't debut until Sunday, ET was invited to get an early peek at the emotionally-charged premiere episode. Here are some of the most heartfelt and revealing moments from the first episode of I Am Cait.

WATCH: Caitlyn Jenner Rides a Motorcycle, Looks Glam in New 'I Am Cait' Promo

1. Caitlyn's mom struggled with the transition.

In the first episode we meet Caitlyn's mother Ester, as well as her two sisters Lisa and Pam, when they come over to Caitlyn's Malibu home. Ester admits that she's going to have a hard time remembering to refer to her daughter as Caitlyn instead of "Bruce."

While Ester seems to struggle with the change, it's clear from her appearance with Caitlyn at the ESPY Awards last week that she supports and loves Caitlyn as much as ever.

2. Kylie saw Caitlyn for the first time over FaceTime.

The first time Kylie saw Caitlyn as herself was when Kylie called her over FaceTime from the dentist's office when she was feeling "loopy." Caitlyn admitted that she was worried her appearance might scare Kylie, who tells her that it doesn't, adding, "You look pretty."

3. Caitlyn spoke with Rob after her Vanity Fair debut.

Kylie wasn't the only one who thought Caitlyn looked wonderful. After her celebrated debut in Vanity Fair, Caitlyn spoke with Rob Kardashian, who was also very supportive and told Caitlyn that he thought she looked great.

4. Kanye commended Caitlyn.

Kanye West makes an appearance on the show, which isn't a huge shock as he's also appeared on Keeping Up With the Kardashians. He also voiced his support, commending Caitlyn for being true to herself even under the pressure of the media spotlight.

5. We meet Ronda Kamihira.

Ronda Kamihira, former assistant and friend to Kris Jenner, was rumored to have been involved romantically with Caitlyn before her transition, when she was living as Bruce and had recently filed for divorce from Kris. Ronda is introduced in I Am Cait as Caitlyn's long-time friend and confidante, who supports Caitlyn and even comforts Ester.

6. Kylie makes good use of her hair extension line.

You can't have a show about the Jenners and the Kardashians without fashion and hairstyle. Kylie and Caitlyn share a sweet moment when the 17-year-old reality star adds her own line of blue and green hair extensions into Caitlyn's long locks. It's a sweet bonding moment.

WATCH: Laverne Cox and Caitlyn Jenner 'Finally' Meet at 'I Am Cait' Screening

Sitting down with James Corden on The Late Late Show, actress Laverne Cox, who also saw an advanced screening of I Am Cait, shared a preview of the debut episode. She talked about the pressure Caitlyn lives under, and how, in the episode, Caitlyn is forced to change cars several times while out and about just to avoid the paparazzi.

I Am Cait premieres July 26 on E! Check out a promo for the docu-series in the video below.

Caitlyn Jenner Gets Candid in New 'I Am Cait' Promo, 'We're Gonna Talk About Everything'

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