THESE ARE ALL REALLY TENUOUS
My sons went to the same school as Keira Knightly
I was standing next to Gerry Halliwell, as she was then,
in the departure lounge at Heathrow airport, she was carrying her first child in a sling.
Again at Heathrow, my husband pointed out famous Irish Golfer, Patrick something or other, but spelt the Irish way, no idea who he was so he might as well not bothered to tell me!
Flying to New York, Paul Gambaccini was further up the plane.
One of my friends reckoned she bought an item of Jerry Hall's clothing from a charity shop JH donated to when she and Mick Jagger lived in Richmond.
Saw Georgia May Jagger in the pub next to their house on Richmond Hill.
James McAvoy was outside a London theatre on his mobile phone when I was having a drink opposite with a friend.
I saw Tony Curtis walk by when I was working up in SW1 that was back in the '70s
George Harrison married Pattie Boyd in my home town when I was at school, my classmates and I found out about that and hot footed it down to the registry office after school, but alas! it was all over by then.
Again in my home town, Sandy Shaw and Samantha Just both opened boutiques, friends and I were about 12 or 13 turned up, mainly so we could gawp at their hair, clothes and make up 
My son as a toddler was grizzling in our local pharmacy when I was getting his prescription made up for Amoxicillin (ear infection) when the late Rick Parfitt (Status Quo) came in and said "what's up mate"
One of my sons and several classmates have a close up photo next to Prince Charles who happened to be at Osborne House, IOW when they were doing their year six week away.
Sitting in a local Pizza Express, John Terry came in, my husband said "don't look now, John Terry's over there" to which I replied "who?" no idea who he was then
Also in Pizza Express, I wasn't there, my husband was having lunch with his business partner and Jennifer Saunders was at a nearby table with her children.
When my children were junior school age I took them to a local park roller blading, one afternoon Richard E Grant sped in with his child they were both on blades too.
Last year saw Rob Brydon and his children in our local high street.