Supposedly a story going around is that Brooke and Ziggler have been flirting a bit openly recently with Rusev telling them its a better idea to just send private DMs to each other instead of public tweets and messages. Doesn't mean Ziggler was responsible for the leak but that it was probably a lot easier for the pictures to end up in the wrong hands.
Also her having a unique tattoo on her butt gave away who was in the pictures leaked.
http://www.cagesideseats.com/wwe/201...pond-perfectly