Several points to make.
1. You can add Andie McDowell and Renee Russo to the list of successful models turned actresses.
2. Yes, I have seen "Sirens", and it was glorious to hear a woman with a sexy accent saying the double "b" word, while using it in a sexual manner. Sadly, no such scene has been done that way since.
3. Now knowing that ppfd is an actor, I can't help but to imagine what if scenarios where he manages to get a job as an extra on the set of a Katharine McPhee movie, especially if there's a scene that takes place at a swimming pool or beach, with Kat in a bikini!
4. I suppose Emily could always go the way of Kathy Ireland, in which she stars in a movie every now and then, but none of the movies are all that great, or the roles are any that good. If she's expecting great and challenging, leading roles, she's in for further disappointment.
5. As for the guy taking photos story, while the laws do say that once you are out in public, it's perfectly normal for people to take your picture without you knowing it. However, taking pictures of bikini clad women using sneaky means does come across as creepy, and I don't recommend doing it. I was once caught creeping on a photo session by a public pool, that featured several gorgeous Asian models in bikinis. Needless to say, the photographer and models had me removed from the area quite quickly, once they noticed my eyeballs popping out of their sockets.