Its possible the girl might have started and handed that picture to the agency to put up and they thought it was her, I have heard some girls have done this with agencies before and they assumed/took her word its her.
Yeh I get the same problem. Whenever David Cameron is on TV, people comment that its me. We could be twins me n Dave. I have great fun with this. I just give them a picture and I get into State Dinners, FA Cup finals, Bullingdon Club reunions, Boris Johnsons parties, .........