I have met several celebrities:
I recently saw Rachel Stevens walking along Regent Street

. She is even nicer looking in real life. Very cute.
I have also walked into Daniella Westbrook (pre cocaine nose job) in Tower Records in picadilly. I was walking along behind her, she stopped. I didn't and she gave me a very dirty look.
Last, but certainly not least, Claire Danes (Romeo and Juliet, Terminator 3) filmed a period drama where I worked. I walked into her too. Then was chased off by a rather large extra.
And, unlike kronas, I have been known to use punctuation....