Hi, I'm posting for an opinion on something that left me feeling quite disturbed the other day... Long story short, another photographer came to my shoot uninvited and shot every setup I had created. The shoot was for an extremely high profile client and my makeup artist cancelled at the last minute. It was all a bit of a rush and I posted on makeup forums for a makeup artist. I received a reply from a local mua, and arranged for her to come to the shoot. When she arrived, she started actively networking with all the team members of my shoot telling everyone she was a photographer as well and was on the lookout for good team members and models. After handing out her business card to everyone, she pulled a camera out of her bag with a flash attached and started doing BTS photography. I asked her politely if she could stop for a minute as her flash was triggering my studio lights and disabling my sync. A few moments later she came over and asked if she could take a picture of the models. I let her. But after I finished a set of images, when I was distracted talking to a team member and with my back to the shoot area, she came in again and began shooting with the model and did a series of posed pictures with the model. Unaware of what had happened, I continued to shoot the next look. With the next look finished, I said we should break for lunch, and while I was distracted with the lunch arrangements, she went over to the models who were still in situ and proceeded to take about 50 posed shots of the models. I know this in retrospect as I was streaming the shoot on periscope. When I noticed she had been taking images, and she replied 'don't worry - I'm not taking over, and my images won't compare in any way with yours hun'. I gave her a warning that they would be only for her own record and that they were not to be published anywhere as the shoot was going to be submitted to a magazine. What disturbs me about this, is I've worked for almost seven years as a fully professional photographer now, I hire the studio, I spent three weeks planning the shoot, with full art direction, did all the styling myself (I'm very OCD about getting everything right), worked out all the technicalities of a high-end lighting setup, had all the models poses and shots planned out...And this other photographer came in, and took the images I was taking - which were the result of all my hard work. Thankfully, she had to leave in the afternoon as she had another appointment, but told everyone on the way out to get in touch with her via facebook for images and to arrange shoots. I'm just wondering what other photographers think of this - has this ever happened to you? What do you think is the point where someone crosses the line? And how would you handle this? - Thanks in advance for your opinion!