Rossum opted for an embellished, all-white, off-the-shoulder Carolina Herrera dress with a dramatic train.
The Shameless star shared to Vogue that she knew she wanted Herera as her wedding dress designer.
On the special, Rossum worked with Jo Baker, who did her bridal makeup, and stylist Thomas Carter Phillips who helped her accessorize.
And the most important accessory on her special day was her vintage Chaumet round-cut diamond engagement ring, circa 1920.
She told the outlet that she and her husband had actually seen during the initial days of their relationship.
At the time, Esmail had asked her what kind of ring she would like if they got married one day.
"And so I said, 'I'd like something like this.' It's old; I like things that are old, I like the history behind them, I like to imagine who wore them before," shared the Poisedon actress.
But little did she know that her husband would return the store later that week and put a deposit on the ring.
