I don't know anyone famous tho I did go to HS with a kid who ended up playing for the RedSox for about 2 games before being sent back to the minors.
Living so close to Gillette, we see many of the NFL players around and when I was a kid I went to school with their kids - one of my best friends in college even saw one wearing just a face cloth when she was babysitting his kids and he came out of the shower not realizing she was there.
I don't know that I'd call it "knowing" but DH has met several dozen numerous famous and semi-famous people (Kitty and Mike Dukakis, Steve Grogan, local TV anchors, the owner of the Miami Heat, a few other sports stars) - he's even been inside their houses - how has he met so many locally famous people? working on their boilers of course.