I would no more than 4. As long as you include the photos and the SASE the celeb shouldn't have a problem with it. {thumb2} I'm sure most will argue about sending that many, but I personally think that's a good number. Especially with the time it takes to handwrite your letter and prepare the request.
Remember that the celebrity will only be at the address for a limited amount of time and probably has a lot of fan mail to answer in that limited timeframe. So, please keep the number of photo's to a reasonable amount. 2-3 max. For every extra photo you have the celebrity sign, one less fan will get there photo's signed...
I always send 1 or 2 never more than 2 because i think its a bit greedy and selfish because no one person could need 4 autographs from the same person and the celebs know this and i think it would make them turned off a bit and maybe open less mail so you might get your 4 back but maybe because of it the next person will get nothing.Be reasonable i can understand 2 because sometimes you cant decide on 1 or want one colour and one black and white but i think collectors sending 4 pictures is ruining the hobby and will make more celebs switch to pp photos or not sign at all...just my opinion on this no offence meant.