I've never really LOVED any celebrities- until I came across RedFoo of LMFAO (yes, I'm pretty obsessed and can't stop thinking about him). I knew I liked him a lot so I went to his concert, he came over by me and stared directly into my eyes for longer than anyone in my life has ever stared at me!
Other than that, we do kind of know celebrities since we always hear their opinions and what is going on in their lives. They are not complete strangers.