The photo follows Tuesday’s debut of a new video promo for the series.
Jenner, 65, is also documenting her new life with a series of blogs at WhoSay.com. In the first post, she discussed getting to know other members of the transgender community.
“Seeing how my new friends have overcome their adversities is such an inspiration. They are so well-adjusted and smart,” Jenner wrote. “I’ll be sharing their stories here in the coming weeks, and I can’t wait for you to get to know them. They are just like you and me.”
RELATED VIDEO: Caitlyn Jenner’s Message to Transgender Youth: ‘We Are All Beautiful”
I Am Cait premieres July 26 at 8 p.m. ET on E!