I honestly don't think the 'send me a photo holding a peice of paper with date/time/name' thing on is helpful... This is feeding a fantasy and making it seem quite exciting and dramatic. You need to take control of this. Write to the popstar's agent, explaining the situation, and asking for a letter from the agent confirming that this popstar would not get involved with this type of correspondence. This needs to be nipped in the bud now. Don't tell your daughter you are writing to the agent, as this may seem exciting or intrusive to her. Also, if she has internet access in her room (and I am assuming she does as she was on it at 2am), it needs to be removed from her room and put in a family area, where you can see, at all times, what she is doing and who is speaking with her. You need to explain to her that it's not that you don't trust HER. Also, there are some good sites out there to encourage young people how to be safe and responsible on line. There are also plenty of stories of younf people who have been duped. You don't want to scare her, but at 16, if she thought that the least that was happening was a couple of young lads were having a laugh at her expense, I suspect that may be enough to snap her out of it.