The Queen has hosted a reception for more than 300 Irish people including One Direction singer Niall Horan, X-Factor judge Louis Walsh and former boxer Barry McGuigan.
The Buckingham Palace event was held to mark the contribution made by Irish people in Britain.
A Palace spokesman said: "It was a really fun evening - great company and extremely relaxed.
"Her Majesty seemed to enjoy the craic."
The Queen and the Duke of Edinburgh met guests from the world of sport, business, politics, the arts and community work who were deemed to have made a positive contribution to Britain.
Also among the guests were fashion designer Orla Kiely, racehorse trainer Jonjo O'Neill, former Formula One racing boss Eddie Jordan, singer Imelda May and Father Ted writers Graham Linehan and Arthur Matthews.
Niall Horan described being at the palace as "mind-blowing".