Their film has received praise for featuring an astounding lead performance.
Christina Hendricks and Sienna Miller were looking their finest at the premiere of their new film American Woman at the ArcLight theater in Hollywood on Wednesday.
The 44-year-old Mad Men star drew from the 1960s for a striking multicolored dress, whereas the 37-year-old American Sniper star favored a gleaming golden gown.
On point: Christina Hendricks, 44, and Sienna Miller, 37, were looking their finest at the premiere of their new film American Woman at the ArcLight theater in Hollywood on Wednesday
Christina's multi-pattern dress featured large swaths of red, along with strips of black fabric with floral designs and purple and gray paisley.
She put on a busty display with the low-cut outfit, and a slim black belt around her midriff highlighted her curvaceous figure.
The 5ft7in Good Girls star had her trademark fiery tresses in tight curls, matching her '60s theme.
The floor-length dress mostly obscured her pink and yellow open-toe footwear, and she accessorized with a golden clutch in a woven pattern.
Throw-back: The Mad Men star drew from the 1960s for her multicolored dress
Multicolored: Christina's multi-pattern dress featured large swaths of red, along with strips of black fabric with floral designs and purple and gray paisley
Curvy beauty: She put on a busty display with the low-cut outfit, and a slim black belt around her midriff highlighted her curvaceous figure
Red hot: The 5ft7in Good Girls star had her trademark fiery tresses in tight curls, matching her '60s theme
Enveloping look: The floor-length dress mostly obscured her pink and yellow open-toe footwear, and she accessorized with a golden clutch in a woven pattern
Sienna opted for a simpler color scheme with a cleavage-baring gold sequined gown.
The classic look featured a crimped skirt, and the sleeveless top put her toned arms on display.
Her dress included a slim golden belt, and she added a pair of matching gold heels.
The Lost City Of Z actress' blonde tresses cascaded down her shoulders in loose waves, and she completed the look with large hoop