I was chosen from my primary school year 6 along with another pupil to go to the Queen's Jubilee at a local manor house where we "met" her. I use the term met lightly as it was her walking down the red carpet being introduced to us and we all said hello and she said hello back
Justin Timberlake also got on the same plane as us to NYC back in Feb '08 and he walked through the waiting bit with his body guards and everyone just went silent LOL.
And on the same trip we saw Pharell in the JFK airport on the way home and as we were waiting to board our plane home we saw Paul O' Grady who had a brief chat with us. Was a pretty successful trip for celeb spotting