Some of my coworkers, who I am friends with, just found out I got a raise and they didn't (through some leaked emails). Now they are acting a little resentful and making occasional snide comments about how I make more than them. They try to play it off like it's a joke but there's a definite undercurrent of resentment. What would you do in this situation?

edit: The bosses were discussing employee salaries and bonuses via email. One of our bosses was on vacation and his emails were being forwarded to his assistant, and she spread the news.