My mum's met a few:
Twiggy - says she was rude as she made a dress for her but she didn't pay/wasn't thankful.
Roger Moore - charming
an older type man in a Bentley (British actor) who apparently drove her home and her dog and gave dog food, don't know name
David Walliams - asked cousin of SIL's out when she worked or was eating at The Ivy and then she flew out to LA and discovered he was cheating on her and she flew back, she was at least 15 years younger than him too.
I used to see people like Zoe Ball, Lily Allen etc all the time in London where we worked - nothing good or bad to say about them, quite normal.
Noel Gallagher - once hid behind counter of fish and chip shop in Marylebone where we went after a dance class - we honestly couldn't have cared less who he was so that came across as a bit twattish.
Brand New Heavies - ex male platonic friend grew up with them - they seem ok but a bit 'music biz' types. He also grew up with Jay Kay.
Used to work with George Clarke - nice enough guy, lovely eyes but a bit up himself.
My auntie used to be a fairly well known model in early/mid 1970s - she was very close friends with Robert Palmer (said he was lovely, she has a photo taken with him as friends) and met various people like Freddie Mercury (in photoshoot for sunday supplement magazine) - said he was lovely and vast majority of them were.
Family friends rented out their Cheyne Walk house to Jack Nicholson - said he was very nice.
One of the brothers - youngest I think of the Miss World family fame - was a close friend of DB's when young - nice enough man but you could tell he thought it was great his money and fame could get him anywhere...
My DM also got work for Dave Allen (voiceover) said was nice, and used to know Jan Pienkowski and some others - said lovely. DM worked in advertising so knew a few people who started out unknown then got famous. Justin de Villeneuve who she knew (DH of Twiggy) said to be vile.
I met Jimmy Savile as a kid as I fund raised for him once - nothing good or bad and was too young but he certainly wasn't the laugh a minute man on TV.