This is exactly the kind of things we have been warning couples about. You don’t take such pictures and relax about them because she is your wife and he is your husband. You don’t know when it will get outside your phone.
Now, who are you going to blame? Yourselves or the person that stole the pictures? Who ever you blame, the y are out and you can not do anything about it. Do not do such things on camera for whatsoever reasons. Period.