For the event, Davis wore an all-white suit, while Anderson sported a pink and purple gown, and Pfeiffer wore a puff-sleeve black midi dress.
After photos of the trio surfaced on social media, fans were swooning over their "ageless" appearances.
"The three women who don't know how to age," one fan penned via Instagram, while another chimed in, "All three of you look absolutely amazing and half your age. It's uncanny!"
"Nothing but the supremacy of Viola Davis, Michelle Pfeiffer, and Gillian Anderson in this house," someone else tweeted.
"Beautiful, and they're all ageless," someone else penned.
"Viola Davis, Gillian Anderson and Michelle Pfeiffer really do run the world," wrote another.
One commenter wrote via Instagram: "They're absolutely gorgeous."
"You ladies have clearly found the fountain of youth. So beautiful! Stunning outfits too!" one fan added.
"Not Michelle Pfeiffer being in her 60s looking like she's still 40. Wild," another penned.
One Twitter user weighed in: "No thoughts, just Michelle Pfeiffer being the prettiest woman in the world."
"The big three: Viola Davis, Gillian Anderson and Michelle Pfeiffer," another tweeted.
THE BIG THREE: VIOLA DAVIS, GILLIAN ANDERSON AND MICHELLE PFEIFFER 🤍 pic.twitter.com/gbYH9nwLIR
— dana 🛸 (@gillianmaslany) June 20, 2022
"The First Lady" is a 10-episode series — and all episodes are available at once, making it the perfect series for binging. Here in Canada, you can watch in on Crave.
Alongside Davis, Anderson and Pfeiffer, the cast also features a few other familiar faces — including O-T Fagbenle as Barack Obama, Kiefer Sutherland as Franklin D. Roosevelt, Dakota Fanning as Susan Ford, Lily Rabe as Lorena Hickok and Regina Taylor as Marian Shields Robinson.