The 54-year-old actor and his wife Rita Wilson recently got the chance to have dinner at the London palace with The Queen as well as US President Barack Obama.
Speaking about the meeting, he said on The Graham Norton Show: 'I was with The Queen and the President just last week and as an American I kept thinking: 'How did this happen? Did I win a ticket?'
'We got an email from the White House saying 'the President and Mrs Obama would like you to join them for dinner at Buckingham Palace' and I was chatting to Her Majesty and we compared notes on Shakespeare.'
The full interview airs on The Graham Norton Show on BBC One on June 10.