One Direction's Niall was invited to enjoy a special reception with the Queen.
The Buckingham Palace event was held to celebrate the contribution made by Irish people in Britain.
The Queen and the Duke of Edinburgh met guests from the world of sport, business, politics, the arts and community work.
Niall was joined by three hundred Irish people, including X-Factor judge Louis Walsh.
The 1D star described being at the palace as "mind-blowing".
He said: "It's an absolute honour to be here with two great countries coming together - I couldn't believe it when I got the invitation.
"To have met Her Majesty again was a great experience," said Niall.