Whatever size is up to you. I don't think celebrities care about the size. I have sent all sizes (8X10, 5x7, 4X6) and had them all signed. I always look at the price and how much am I willing to spend.

Also, buying photos might get expensive so you might try to get some online and print them off at a store near you or use your home computer.

If you need more help feel free to pm me or respond in this post.

BossC

Celebrities usually send 8x10s but you can send any size of photos you'd like. If you don't want the photos too small or too big, send like a 5x7

...photo should I buy from allposters.com? like, what is the avergage size that celebs autograph and send back to you?