I've seen multiple actors from the various Star Trek shows around town when I've been in town around the convention (early August). I'm less likely to recognize people out of context, but my wife has noticed several actors at the airport. Most of them were from sit-coms, so I'm guessing they may also perform stand up in Vegas. The real question is what celebrities have you been mistaken for. In Vegas, I've been mistaken for Penn Gillete (when my hair was long enough for a ponytail) and Seth Rogan. Outside of Vegas, I've been mistaken for Hank Williams Jr. many years ago as well as Robin Williams (after his death). You'll notice I've never been mistaken for particularly pretty celebrities.