Julia Louis-Dreyfus is "Roar"-ing through her fight with breast cancer.
"Chemo #2: finito. We are NOT f-ing around here," the Veep star, 56, shared on Instagram Thursday along with a photo of herself in sunglasses and a black hoodie jacket along with a fake mustache drawn above her upper lip.
Louis-Dreyfus also thanked Katy Perry, as well as Veep co-stars Tony Hale and Timothy Simons, for being "hilarious and loving inspiration" amid her cancer battle. In addition, the Emmy winner quoted Perry's 2013 hit single "Roar."
The post was the first photo of the actress since she announced her breast cancer diagnosis on social media in late September.
The mother of two's rep told PEOPLE in a statement, "Julia is incredibly grateful for the outpouring of support and well wishes."
Also in September, HBO told PEOPLE in a statement that Louis-Dreyfus learned she had breast cancer just one day after she won her sixth consecutive Emmy, setting the record for most wins for a performance in the same role for the same series.