For me it was Jeff Kinney. I was meeting a different author I love, but there wasn't enough room downstairs and we had to go up. Turns out that's exactly where Jeff Kinney works! He's the author who got me into reading so I thought that was so cool
50 cent. He was at a charity function I attended for work. I buckled and joined the people asking for pictures. He was ridiculously nice, absolutely JACKED and smelled incredible.
Slightly different genre I also met Amy Grant at a different charity event for work. Also very nice, slightly less jacked and no discernable smell to speak of.