The Orange Is the New Black star snapped a selfie with the reality star on Sunday night, writing: "@caitlynjenner and I finally met in person at a special private advance screening of #IAmCait. #TransIsBeautiful #girlslikeus."
Cox, a transgender actress and outspoken advocate for LGBTQ rights and causes, has frequently spoken about the spotlight Jenner has helped shine on transgender issues. She was one of the people Jenner thanked after introducing herself to the world in Vanity Fair.
The actress has also been a trailblazer in the community, becoming the first transgender performer to ever got nominated for an Emmy and the first transgender person to ever appear on the cover of Time magazine.
On Wednesday, Cox posted a photo of Jenner speaking at the ESPY Awards, along with a quote from her powerful address, which Cox captioned: "Love this! Go Caitlyn #TransIsBeautiful."
For more on Jenner's emotional call for action, check out the video below.