The phrase "fellow actress" refers to another woman who is also an actress, meaning she shares the same profession or job as the person being referred to. Full definition
They were joined by fellow actress Sasha Lane, also sticking with the flower theme in a totally different look. (justjared.com)
Nov. 21, 1977: Partying with fellow actresses Amy Irving and Teri Garr while in the first flush of «Star Wars» success. (sfchronicle.com)
She opened up to Harper's Bazaar about the film industry's body standards, and just like fellow actress Melissa McCarthy, Lawrence would like to see some major changes in the way Hollywood, and society as a whole, defines normal. (health.com)