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Caitlyn Jenner: New I Am Cait Teaser Shows Her Mother's Emotional Reaction

Plus: Why did Kim Kardashian veto a dress?

Liz Raftery

The latest teaser for Caitlyn Jenner's upcoming docuseriesI Am Cait reveals her mother Esther's emotional reaction to Caitlyn's coming out as transgender. "My first feeling was, 'I lost my son,'" Esther Jenner recalls. "Then I thought, you know what? I'm gaining."

Esther Jenner, 88, previously said that it would be "a struggle" to stop using male pronouns and calling her child Bruce, but one that she'd take on "happily."

The 30-second clip, which debuted Monday, also shows Caitlyn - looking stunning as always - giving a motivational speech to a group of teens and tearfully admitting that she wants her children "to be proud of their daddy."

Kim Kardashian: I ran away when I learned Caitlyn's "secret" 12 years ago

And, the former Olympic champ is briefly seen getting fashion advice from stepdaughter Kim Kardashian, who nixes a black dress for a pretty amusing reason.

Check out the new teaser below. I Am Cait premieres Sunday, July 26 at 9/8c on E! Will you watch?