Mother in law

Mindy • I am married to an amazing man, mommy to an incredibly gorgeous boy (10.31.2015). I am 27 years old and we are trying for baby #2.
So I post updates every week of my baby belly and other pictures on MY Facebook, well my mother in law takes every picture and post to her wall without asking me. How do I handle this? I know she is excited, but my body, my pictures she needs to ask. I know who all is on my Facebook so clearly I can post whatever I want. Really annoyed right now.