I don't recall anyone saying resemble a celebrity. However, it's fairly common for people to mistake me for someone they already know and walk up and resume some previous conversation. It's so strange! They insist they know me from a lecture on mathematics I did (that will be the day!!!), or a tile order we were discussing, or my local (Tampa) cooking show..... One guy at my gym heard my voice and spun arroung and addressed me as Sarge. Apparently, I looked like his drill sargeant from when he was in the Army. He was real cute but I don't think he was coming onto me. Go figure.
Dave