Watch: Dominic West was spotted getting close to Lily James in Rome
Pictures had emerged of The Affair star, 50, and Downton Abbey actress James, 31, looking very close while in Rome together at the weekend.
West and FitzGerald, 49, have posed together for pictures outside their home in Wiltshire holding hands and kissing as the actor told reporters: “I just want to say our marriage is strong and we are very much still together.”
A note was also pinned to the gate for awaiting photographers which read: “Our marriage is strong and we are very much still together. Thank you.” and signed by both FitzGerald and West.
The couple met as students at Trinity College Dublin. They rekindled their romance several years later and have four children together – daughters Dora, 14, and Christabel, seven, and sons Senan, 12 and Francis, 11.
They married in 2010 and split their time between their homes in England and FitzGerald’s family home Glin Castle in Ireland.
The landscape gardener is an Anglo-Irish aristocrat whose father was the last Knight of Glin.
She was previously married to Viscount Lambton between 1995 and 2002.
West has a 22-year-old daughter Martha with ex-girlfriend Polly Astor, daughter of the politician Michael Astor.
James had been in an on-off relationship with 37-year-old Doctor Who star Matt Smith for the past five years. It was recently reported they had split for good after attempting to rekindle their relationship during lockdown.
West and James star together in the upcoming BBC adaptation of Nancy Mitford’s romance novel The Pursuit Of Love. Filming had begun in the spring but was postponed due to the COVID-19 pandemic and subsequent lockdown.
The pair also starred on stage in Othello together at Sheffield’s Crucible Theatre in 2011.
Paparazzi pictures published by The Daily Mail showed West and James riding an electric scooter together through the streets of Rome.
Read more: Lily James 'keen' to do less period dramas
Photos of the pair seated outside a restaurant shows West stroking James’s hair and holding her shoulder as he leans in and apparently nestles his face in her neck.
Watch: Dominic West admits he did 'leap in the air with joy' over Trump coronavirus news