And on his arm was Victoria Keon-Cohen, founder and co-chairperson of the UK's first trade union for models, the Equity Models Union.
The Cork actor has been single since February, when he was last pictured with long-term girlfriend and heiress Reena Hammer.
The couple were together for seven years.
The Tudors star has struggled with alcohol and depression in recent years.
However, his appearance at Saturday's function in London will bring some cheer for fans of Rhys Meyers.
He was sporting a dark suit, while Victoria was dressed in white, and the smart-looking couple cut a dash as they made an entrance.
This is his first public event in two years -- and with Victoria by his side he looks like he's back on top form.