The couple, who marked their 21st wedding anniversary earlier this month, appeared together at The Plaza Hotel in New York City.
Keeley Hawes and her husband, Succession star Matthew Macfadyen, enjoyed a rare date night at the Netflix premiere of Death By Lightning on Monday.
The series recounts the true story of James Garfield's presidency and his assassin, Charles J. Guiteau, in 1881.
"It will follow Charles' descent into madness as what starts as an allyship with the American President becomes a deep, and deadly, obsession."
Based on a historical miniseries and novel, the show explores the events leading to Garfield's assassination.
Author's summary: Keeley Hawes and Matthew Macfadyen celebrated their 21st anniversary with a stunning red carpet appearance at the historical drama Death By Lightning premiere, revealing the dark story behind Garfield's assassination.