Twice (strangely in the same week).
First, I recognised a girl who I had not met but had at some point hotlisted when I was in the supermarket one evening. I wasn't sure it was her until I got home, checked her profile and it said she was touring in my town for a few days.
The second one is a bit better. There was a girl at work (same office, totally different area of the business, so I don't think I even spoke to her apart from a 'good morning' in the kitchen), who was strikingly attractive, very distinctive face, hair and jewellery, car which seemed far too expensive for the job she was doing. Anyway, one evening I was doing my normal search on AW and saw a dominatrix profile which I was fairly sure was her (as I say, she looked very distinctive). A few days later she was in the office and wearing a particular necklace which was on one of her profile photos. She also added a link on her AW profile to her personal website. The website stated it was owned by a company which had the same name as her working name. The name of the sole director of that company was the same as the name of the girl who worked in my office (and again, not a very common name).
This could potentially have been awkward but fortunately her profile was totally about dominatrix stuff, which doesn't interest me at all, and as I say, I never really spoke to her, so it didn't cause a problem. A couple of months after I saw her profile she stopped working at my office. Her AW profile still exists though.