Charlie Sheen and his ex-wife, Denise Richards, were doing really well for a while but it seems that phase has ended for the time being.

On Father’s Day, Sheen went on a Twitter rant about Richards while praising his third wife, Brooke Mueller instead.

“Brooke M is a sexy rok star whom I adore D Richards a heretic washed up piglet Shame pile Happy Father's Day!!!” he wrote.

He then addressed an “open letter to the media" about Richards, which has since been deleted, where he calls her the "worst mom alive" and an "evil terrorist,” E! Online reports.

This is surprising since Richards took over temporary guardianship of Sheen’s twins with Mueller, Bob and Max, when Mueller was having drug addiction issues.

Richards did not respond hastily to his rant, instead tweeted, "Happy Dad's Day! @CharlieSheen have a great trip in Mexico! Kids were disappointed u weren't here for it—Hey we'll celebrate when u r back!"

A fan asked Richards if his trip “work related” she simply replied, “nope.”

image via Dara Kushner/INFphoto.com