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Caitlyn Jenner, Esther Jenner, Pam Mettler, ESPY Awards

Kevin Mazur/WireImage

Esther Jenner is one proud mama.

This Sunday's episode of I Am Cait followed Caitlyn Jenner's mum's journey to accepting her new daughter. After a few emotional ups and down, Esther and Caitlyn's bond proves to be stronger than ever.

"I was so proud of Bruce when he stood on that podium receiving that gold medal in Montreal. I had tears and the American flag was going up in the middle and I thought that I could never be more proud of him," Esther says in this I Am Cait clip. "And you know, I was wrong. Because I am more proud of him for the courage that he has shown. I love him with all my heart and I certainly love her with all my heart."

How sweet?!

Caitlyn also gets lots of support from other family members in the premiere, including Kylie Jenner, Kim Kardashian and Kanye West.

"The tremendous amount of support I've gotten has been overwhelming, but you also have to realize it's not this way for everybody," Caitlyn said. "There are so many people that have struggled with family, who struggle with friends, who struggle with ridicule or not having financial resources."

I Am Cait is Express from the U.S. tonight at 9.30 p.m., only on E!