Caitlyn Jenner's Mother, Esther, Reacts to Transition in New Promo

— -- A new teaser of "I Am Cait" shows Caitlyn Jenner's mother showing nothing but support after admitting she first had a hard time with the former Olympian's transition.

In the new 30-second spot on E! that went live Monday, Esther Jenner, 88, says, "My first feeling was, 'I lost my son.' Then I thought, 'You know what? I'm gaining!'"

The clip also shows Caitlyn Jenner, 65, inspiring others and talking to children, saying, "We are all beautiful!"

At the end of the clip, Caitlyn Jenner shows Kim Kardashian a black dress and says, "Love this dress," to which Kim replies, "Mom has that."

"I Am Cait" premieres July 26 on E!